release

diylc/diylc-core/pom.xml

@@ -7,7 +7,7 @@
     <parent>
         <groupId>org.diylc</groupId>
         <artifactId>diylc-parent</artifactId>
-        <version>5.8.0</version>
+        <version>5.9.0</version>
     </parent>
     
     <artifactId>diylc-core</artifactId>

diylc/diylc-core/src/main/java/org/diylc/clipboard/ComponentTransferable.java

@@ -29,6 +29,7 @@ import java.io.Serializable;
 import java.util.List;
 import java.util.Set;
 
+import org.diylc.core.ComponentGroup;
 import org.diylc.core.IDIYComponent;
 
 /**
@@ -44,19 +45,21 @@ public class ComponentTransferable implements Transferable, Serializable {
   public static final DataFlavor listFlavor = new DataFlavor(ComponentTransferable.class, "application/diylc");
   
   private List<IDIYComponent<?>> components;
-  private Set<Set<IDIYComponent<?>>> groups;
+  private Set<ComponentGroup> groups;
+  private String name;
 
   public ComponentTransferable() {
     super();
   }
   
-  public ComponentTransferable(List<IDIYComponent<?>> components) {
+  public ComponentTransferable(List<IDIYComponent<?>> components, String name) {
     super();
     this.components = components;
+    this.name = name;
     this.groups = null;
   }
 
-  public ComponentTransferable(List<IDIYComponent<?>> components, Set<Set<IDIYComponent<?>>> groups) {
+  public ComponentTransferable(List<IDIYComponent<?>> components, Set<ComponentGroup> groups) {
     super();
     this.components = components;
     this.groups = groups;
@@ -84,7 +87,11 @@ public class ComponentTransferable implements Transferable, Serializable {
     return components;
   }
   
-  public Set<Set<IDIYComponent<?>>> getGroups() {
+  public Set<ComponentGroup> getGroups() {
     return groups;
   }
+
+  public String getName() {
+    return name;
+  }
 }

diylc/diylc-core/src/main/java/org/diylc/clipboard/ComponentTransferableFactory.java

@@ -17,15 +17,11 @@
  */
 package org.diylc.clipboard;
 
-import java.util.ArrayList;
+import java.util.*;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Objects;
-import java.util.Set;
 import java.util.stream.Collectors;
 import org.apache.log4j.Logger;
 
+import org.diylc.core.ComponentGroup;
 import org.diylc.core.IDIYComponent;
 
 public class ComponentTransferableFactory {
@@ -40,13 +36,19 @@ public class ComponentTransferableFactory {
     return instance;
   }
   
-  public ComponentTransferable build(Collection<IDIYComponent<?>> selectedComponents, Set<Set<IDIYComponent<?>>> groups) {
+  public ComponentTransferable build(Collection<IDIYComponent<?>> selectedComponents, Set<ComponentGroup> groups) {
-    Set<IDIYComponent<?>> originalComponentSet = new HashSet<IDIYComponent<?>>(selectedComponents);
+
     List<IDIYComponent<?>> originalComponents = new ArrayList<IDIYComponent<?>>(selectedComponents);
+
+    Map<UUID, UUID> idMap = new HashMap<>();
+
     List<IDIYComponent<?>> clonedComponents = originalComponents.stream(
         ).map(x -> {
           try {
-            return x.clone();
+            IDIYComponent<?> clone = x.clone();
+            clone.setId(UUID.randomUUID());
+            idMap.put(x.getId(), clone.getId());
+            return clone;
           } catch (CloneNotSupportedException e) {
             LOG.error(e);
             return null;
@@ -54,22 +56,11 @@ public class ComponentTransferableFactory {
         })
         .filter(Objects::nonNull)
         .collect(Collectors.toList());
-    Set<Set<IDIYComponent<?>>> clonedGroups = new HashSet<Set<IDIYComponent<?>>>();
 
-    for (Set<IDIYComponent<?>> group : groups) {
+    Set<ComponentGroup> clonedGroups = groups.stream().map(group ->
-      if (group.isEmpty())
+        new ComponentGroup(group.getComponentIds().stream()
-        continue;
+            .map(idMap::get).collect(Collectors.toSet()), group.getName()))
-      
+        .collect(Collectors.toSet());
-      if (originalComponentSet.contains(group.iterator().next())) {
-        Set<IDIYComponent<?>> clonedGroup = new HashSet<IDIYComponent<?>>();
-        clonedGroups.add(clonedGroup);
-        for (int i = 0; i < originalComponents.size(); i++) {
-          if (group.contains(originalComponents.get(i))) {
-            clonedGroup.add(clonedComponents.get(i));
-          }
-        }
-      }
-    }
     
     return new ComponentTransferable(clonedComponents, clonedGroups);
   }

diylc/diylc-core/src/main/java/org/diylc/common/IGroupProcessor.java

@@ -0,0 +1,52 @@
+/*
+    DIY Layout Creator (DIYLC).
+    Copyright (c) 2009-2025 held jointly by the individual authors.
+
+    This file is part of DIYLC.
+
+    DIYLC is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DIYLC is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+package org.diylc.common;
+
+import java.util.Set;
+
+import org.diylc.core.ComponentGroup;
+
+/**
+ * Interface for component grouping operations.
+ * 
+ * @author Branislav Stojkovic
+ */
+public interface IGroupProcessor {
+
+  /**
+   * Returns the set of component groups in the current project. Each group is a set of components
+   * that are grouped together.
+   *
+   * @return set of component groups
+   */
+  Set<ComponentGroup> getComponentGroups();
+
+  /**
+   * Groups all selected components.
+   */
+  void groupSelectedComponents();
+
+  /**
+   * Ungroups all selected components.
+   */
+  void ungroupSelectedComponents();
+}
+

diylc/diylc-core/src/main/java/org/diylc/common/ISelectionProcessor.java

@@ -31,7 +31,7 @@ import org.diylc.core.ExpansionMode;
 import org.diylc.core.IDIYComponent;
 import org.diylc.core.measures.Size;
 
-public interface ISelectionProcessor {
+public interface ISelectionProcessor extends IGroupProcessor {
 
   /**
    * Returns the current {@link ComponentTransferable}.
@@ -89,16 +89,6 @@ public interface ISelectionProcessor {
    */
   void rotateSelection(int direction);
 
-  /**
-   * Groups all selected components.
-   */
-  void groupSelectedComponents();
-
-  /**
-   * Ungroups all selected components.
-   */
-  void ungroupSelectedComponents();
-
   /**
    * Mirrors selected components in the given axis.
    * 

diylc/diylc-core/src/main/java/org/diylc/components/AbstractComponent.java

@@ -30,6 +30,7 @@ import java.lang.reflect.Array;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 import java.util.Arrays;
+import java.util.UUID;
 import java.util.stream.Collectors;
 
 import org.diylc.core.IDIYComponent;
@@ -52,6 +53,7 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
 
   private static final long serialVersionUID = 1L;
 
+  protected UUID id = UUID.randomUUID();
   protected String name = "";
 
   public static Color SELECTION_COLOR = Color.red;
@@ -78,6 +80,19 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
     this.name = name;
   }
 
+  @Override
+  public UUID getId() {
+    if (id == null) {
+      id = UUID.randomUUID();
+    }
+    return id;
+  }
+
+  @Override
+  public void setId(UUID id) {
+    this.id = id;
+  }
+
   @Override
   public boolean canControlPointOverlap(int index) {
     return false;
@@ -186,6 +201,10 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
             field.setAccessible(true);
             Object value = field.get(this);
 
+            if (field.getName().equalsIgnoreCase("id")) {
+              value = getId();
+            }
+
             // Deep copy point arrays.
             // TODO: something nicer
             if (value != null && value.getClass().isArray()

diylc/diylc-core/src/main/java/org/diylc/core/ComponentGroup.java

@@ -0,0 +1,40 @@
+package org.diylc.core;
+
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+public class ComponentGroup implements Serializable {
+
+  private Set<UUID> componentIds;
+  private String name;
+
+  public ComponentGroup(Set<UUID> componentIds) {
+    this.componentIds = componentIds;
+  }
+
+  public ComponentGroup(Set<UUID> componentIds, String name) {
+    this.componentIds = componentIds;
+    this.name = name;
+  }
+
+  public static ComponentGroup from(Collection<IDIYComponent<?>> components, String name) {
+    return new ComponentGroup(components.stream()
+        .map(IDIYComponent::getId).collect(Collectors.toSet()), name);
+  }
+
+  public Set<UUID> getComponentIds() {
+    return componentIds;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+}

diylc/diylc-core/src/main/java/org/diylc/core/IDIYComponent.java

@@ -25,6 +25,7 @@ import java.awt.Graphics2D;
 import java.awt.geom.Point2D;
 import java.awt.geom.Rectangle2D;
 import java.io.Serializable;
+import java.util.UUID;
 
 import org.diylc.core.annotations.ComponentDescriptor;
 import org.diylc.core.annotations.EditableProperty;
@@ -55,6 +56,10 @@ public interface IDIYComponent<T> extends Serializable, Cloneable {
   public static final int WIRING = 5;
   public static final int TEXT = 6;
 
+  UUID getId();
+
+  void setId(UUID id);
+
   /**
    * @return component instance name.
    */

diylc/diylc-core/src/main/java/org/diylc/core/Project.java

@@ -23,13 +23,9 @@ package org.diylc.core;
 
 import java.awt.Font;
 import java.io.Serializable;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.HashMap;
+import java.util.stream.Collectors;
-import java.util.HashSet;
+
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
 import org.diylc.appframework.update.VersionNumber;
 
 import org.diylc.core.annotations.EditableProperty;
@@ -67,6 +63,7 @@ public class Project implements Serializable, Cloneable {
   private Integer dotSpacing;
   private List<IDIYComponent<?>> components;
   private Set<Set<IDIYComponent<?>>> groups;
+  private Set<ComponentGroup> groupsEx;
   private Set<Integer> lockedLayers;
   private Set<IDIYComponent<?>> lockedComponents;
   private Set<Integer> hiddenLayers;
@@ -75,6 +72,7 @@ public class Project implements Serializable, Cloneable {
   public Project() {
     components = new ArrayList<IDIYComponent<?>>();
     groups = new HashSet<Set<IDIYComponent<?>>>();
+    groupsEx = new HashSet<>();
     lockedLayers = new HashSet<Integer>();
     hiddenLayers = new HashSet<Integer>();
     lockedComponents = new HashSet<IDIYComponent<?>>();
@@ -153,20 +151,26 @@ public class Project implements Serializable, Cloneable {
 
   /**
    * List of components sorted by z-order ascending.
-   * 
+   * s
    * @return
    */
   public List<IDIYComponent<?>> getComponents() {
     return components;
   }
 
-  /**
+  public Set<ComponentGroup> getGroupsEx() {
-   * Set of grouped components.
+    if (groupsEx == null) {
-   * 
+      groupsEx = new HashSet<>();
-   * @return
+
-   */
+      if (groups != null && !groups.isEmpty()) {
-  public Set<Set<IDIYComponent<?>>> getGroups() {
+        for (Set<IDIYComponent<?>> group : groups) {
-    return groups;
+          ComponentGroup newGroup = ComponentGroup.from(group, null);
+          groupsEx.add(newGroup);
+        }
+        groups.clear();
+      }
+    }
+    return groupsEx;
   }
 
   public Set<IDIYComponent<?>> getLockedComponents() {
@@ -292,6 +296,11 @@ public class Project implements Serializable, Cloneable {
         return false;
     } else if (!groups.equals(other.groups))
       return false;
+    if (groupsEx == null) {
+      if (other.groupsEx != null)
+        return false;
+    } else if (!groupsEx.equals(other.groupsEx))
+      return false;
     if (lockedLayers == null) {
       if (other.lockedLayers != null)
         return false;
@@ -356,12 +365,8 @@ public class Project implements Serializable, Cloneable {
       }
     }
 
-    for (Set<IDIYComponent<?>> group : this.groups) {
+    for (ComponentGroup group : this.getGroupsEx()) {
-      Set<IDIYComponent<?>> cloneGroup = new HashSet<IDIYComponent<?>>();
+      project.getGroupsEx().add(new ComponentGroup(group.getComponentIds(), group.getName()));
-      for (IDIYComponent<?> component : group) {
-        cloneGroup.add(cloneMap.get(component));
-      }
-      project.groups.add(cloneGroup);
     }
     
     for (IDIYComponent<?> component : this.getLockedComponents()) {

diylc/diylc-core/src/main/java/org/diylc/presenter/InstantiationManager.java

@@ -24,13 +24,7 @@ package org.diylc.presenter;
 import java.awt.geom.Point2D;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Set;
 import java.util.stream.Collectors;
 import org.apache.log4j.Logger;
 import org.diylc.appframework.miscutils.ConfigurationManager;
@@ -68,9 +62,9 @@ public class InstantiationManager {
   public static final ComponentType clipboardType = new ComponentType("Clipboard contents",
       "Components from the clipboard", CreationMethod.SINGLE_CLICK, "Multi", "", "", null, null, 0, false, null,
       false, null, KeywordPolicy.NEVER_SHOW, null, false, null, 0);
-  public static final ComponentType blockType = new ComponentType("Building block",
+//  public static final ComponentType blockType = new ComponentType("Building block",
-	      "Components from the building block", CreationMethod.SINGLE_CLICK, "Multi", "", "", null, null, 0, false, null,
+//	      "Components from the building block", CreationMethod.SINGLE_CLICK, "Multi", "", "", null, null, 0, false, null,
-	      false, null, KeywordPolicy.NEVER_SHOW, null, false, null, 0);
+//	      false, null, KeywordPolicy.NEVER_SHOW, null, false, null, 0);
 
   public InstantiationManager() {}
 
@@ -213,7 +207,10 @@ public class InstantiationManager {
 
     // Update the component type slot so the app knows that something's
     // being instantiated.
-    this.componentTypeSlot = autoGroup ? blockType : clipboardType;
+    String slotName = Optional.ofNullable(componentTransferable.getName()).orElse("Building Block");
+    this.componentTypeSlot = autoGroup ? new ComponentType(slotName,
+        "Components from the building block", CreationMethod.SINGLE_CLICK, "Multi", "", "", null, null, 0, false, null,
+        false, null, KeywordPolicy.NEVER_SHOW, null, false, null, 0) : clipboardType;
 
     if (snapToGrid) {
       scaledPoint = new Point2D.Double(scaledPoint.getX(), scaledPoint.getY());
@@ -224,7 +221,7 @@ public class InstantiationManager {
     
     // copy group information if available
     if (componentTransferable.getGroups() != null) {
-      currentProject.getGroups().addAll(componentTransferable.getGroups());
+      currentProject.getGroupsEx().addAll(componentTransferable.getGroups());
     }
   }
   

diylc/diylc-core/src/main/java/org/diylc/presenter/Presenter.java

@@ -32,17 +32,7 @@ import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.lang.reflect.Modifier;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 import javax.swing.JOptionPane;
@@ -553,7 +543,7 @@ public class Presenter implements IPlugInPort {
               // group components if there's more than one, e.g. building blocks, but not clipboard
               // contents
               if (componentSlot.size() > 1 && !componentTypeSlot.getName().toLowerCase().contains("clipboard")) {
-                this.currentProject.getGroups().add(new HashSet<IDIYComponent<?>>(componentSlot));
+                this.currentProject.getGroupsEx().add(ComponentGroup.from(componentSlot, componentTypeSlot.getName()));
               }
               
               notifyProjectModifiedIfNeeded(oldProject, "Add " + componentTypeSlot.getName(), true, true);
@@ -1727,11 +1717,32 @@ public class Presenter implements IPlugInPort {
   @Override
   public void groupSelectedComponents() {
     LOG.info("groupSelectedComponents()");
+    
+    // Prompt user for group name
+    String groupName = view.showInputDialog("Enter group name:", "Group Components");
+    
+    // If user cancelled, don't create the group
+    if (groupName == null) {
+      return;
+    }
+    
     Project oldProject = currentProject.clone();
-    // First remove the selected components from other groups.
+    // First break any existing groups that contain any of the selected components.
+    // This ensures that if components A and B are in a group, and the user selects
+    // A, B, and C to group together, the old group of A and B is deleted and replaced
+    // with a new group containing A, B, and C.
     ungroupComponents(selectedComponents);
-    // Then group them together.
+    // Then create a new group containing all selected components with the provided name.
-    currentProject.getGroups().add(new HashSet<IDIYComponent<?>>(selectedComponents));
+    // Filter out any null IDs to prevent creating groups with null component IDs.
+    Set<UUID> componentIds = selectedComponents.stream()
+        .map(IDIYComponent::getId)
+        .filter(id -> id != null)
+        .collect(Collectors.toSet());
+    
+    // Only create the group if there are valid component IDs
+    if (!componentIds.isEmpty()) {
+      currentProject.getGroupsEx().add(new ComponentGroup(componentIds, groupName));
+    }
     // Notify the listeners.
     notifyProjectModifiedIfNeeded(oldProject, "Group", false, true);
   }
@@ -2186,14 +2197,11 @@ public class Presenter implements IPlugInPort {
    * @param components
    */
   private void ungroupComponents(Collection<IDIYComponent<?>> components) {
-    Iterator<Set<IDIYComponent<?>>> groupIterator = currentProject.getGroups().iterator();
+    Set<UUID> componentIds = components.stream().map(IDIYComponent::getId).collect(Collectors.toSet());
-    while (groupIterator.hasNext()) {
+    // Remove the group if it contains any of the specified components
-      Set<IDIYComponent<?>> group = groupIterator.next();
+    currentProject.getGroupsEx().removeIf(
-      group.removeAll(components);
+        group -> group.getComponentIds() != null && group.getComponentIds().stream()
-      if (group.isEmpty()) {
+            .anyMatch(id -> id != null && componentIds.contains(id)));
-        groupIterator.remove();
-      }
-    }
   }
 
   /**
@@ -2205,15 +2213,16 @@ public class Presenter implements IPlugInPort {
    *         the minimum, set contains that single component.
    */
   private Set<IDIYComponent<?>> findAllGroupedComponents(IDIYComponent<?> component) {
-    Set<IDIYComponent<?>> components = new HashSet<IDIYComponent<?>>();
+
-    components.add(component);
+    for (ComponentGroup group : currentProject.getGroupsEx()) {
-    for (Set<IDIYComponent<?>> group : currentProject.getGroups()) {
+      if (group.getComponentIds().stream().anyMatch(id -> Objects.equals(id, component.getId()))) {
-      if (group.contains(component)) {
+        return currentProject.getComponents().stream()
-        components.addAll(group);
+            .filter(comp -> group.getComponentIds().contains(comp.getId()))
-        break;
+            .collect(Collectors.toSet());
       }
     }
-    return components;
+
+    return new HashSet<>(Set.of(component));
   }
 
   @Override
@@ -2747,7 +2756,7 @@ public class Presenter implements IPlugInPort {
   @Override
   public void loadBlock(String blockName) throws InvalidBlockException { 
     List<IDIYComponent<?>> components = buildingBlockManager.loadBlock(blockName, currentProject.getComponents());
-    pasteComponents(new ComponentTransferable(components), true, true);    
+    pasteComponents(new ComponentTransferable(components, blockName), true, true);
   }
 
   @Override
@@ -2912,4 +2921,9 @@ public class Presenter implements IPlugInPort {
   public DrawingManager getDrawingManager() {
     return drawingManager;
   }
+  
+  @Override
+  public Set<ComponentGroup> getComponentGroups() {
+    return currentProject.getGroupsEx();
+  }
 }

diylc/diylc-core/src/main/java/org/diylc/serialization/ProjectFileManager.java

@@ -112,6 +112,7 @@ public class ProjectFileManager {
     xStream.autodetectAnnotations(true);
     xStream.alias("point", java.awt.geom.Point2D.class);
     xStream.alias("point", java.awt.geom.Point2D.Double.class);
+    xStream.alias("group", org.diylc.core.ComponentGroup.class);
     xStream.alias("font", java.awt.Font.class);
     xStream.alias("project", Project.class);
     xStream.aliasPackage("diylc", "org.diylc.components");

diylc/diylc-core/src/main/resources/update.xml

@@ -490,9 +490,17 @@
 				<minor>9</minor>
 				<build>0</build>
 			</versionNumber>
-			<releaseDate>2025-12-30 00:00:00.000 CET</releaseDate>
+			<releaseDate>2026-01-10 00:00:00.000 CET</releaseDate>
 			<name></name>
 			<changes>
+				<org.diylc.appframework.update.Change>
+					<changeType>NEW_FEATURE</changeType>
+					<description>Added ability to name groups of components</description>
+				</org.diylc.appframework.update.Change>
+				<org.diylc.appframework.update.Change>
+					<changeType>NEW_FEATURE</changeType>
+					<description>Show groups of components as single items in the Project Explorer list</description>
+				</org.diylc.appframework.update.Change>
 				<org.diylc.appframework.update.Change>
 					<changeType>NEW_FEATURE</changeType>
 					<description>Added balloon tooltip next to cursor showing component width, height and length (where available) while resizing; can be disabled from Config menu</description>

diylc/diylc-library/pom.xml

@@ -7,7 +7,7 @@
     <parent>
         <groupId>org.diylc</groupId>
         <artifactId>diylc-parent</artifactId>
-        <version>5.8.0</version>
+        <version>5.9.0</version>
     </parent>
     
     <artifactId>diylc-library</artifactId>

diylc/diylc-swing/pom.xml

@@ -7,7 +7,7 @@
     <parent>
         <groupId>org.diylc</groupId>
         <artifactId>diylc-parent</artifactId>
-        <version>5.8.0</version>
+        <version>5.9.0</version>
     </parent>
     
     <artifactId>diylc-swing</artifactId>

diylc/diylc-swing/src/main/java/org/diylc/swing/actions/edit/CopyAction.java

@@ -36,7 +36,7 @@ public class CopyAction extends AbstractAction {
   public void actionPerformed(ActionEvent e) {
     ActionFactory.LOG.info("Copy triggered");
     clipboard.setContents(ComponentTransferableFactory.getInstance()
-        .build(plugInPort.getSelectedComponents(), plugInPort.getCurrentProject().getGroups()),
+        .build(plugInPort.getSelectedComponents(), plugInPort.getCurrentProject().getGroupsEx()),
         clipboardOwner);
   }
 }

diylc/diylc-swing/src/main/java/org/diylc/swing/actions/edit/CutAction.java

@@ -36,7 +36,7 @@ public class CutAction extends AbstractAction {
   public void actionPerformed(ActionEvent e) {
     ActionFactory.LOG.info("Cut triggered");
     clipboard.setContents(ComponentTransferableFactory.getInstance()
-        .build(plugInPort.getSelectedComponents(), plugInPort.getCurrentProject().getGroups()),
+        .build(plugInPort.getSelectedComponents(), plugInPort.getCurrentProject().getGroupsEx()),
         clipboardOwner);
     plugInPort.deleteSelectedComponents();
   }

diylc/diylc-swing/src/main/java/org/diylc/swing/actions/file/ImportAction.java

@@ -88,7 +88,7 @@ public class ImportAction extends AbstractAction {
           // presenter
           plugInPort.pasteComponents(ComponentTransferableFactory.getInstance().build(
               presenter.getCurrentProject().getComponents(),
-              presenter.getCurrentProject().getGroups()), false, false);
+              presenter.getCurrentProject().getGroupsEx()), false, false);
           // Cleanup components in the temp presenter, don't need
           // them anymore
           presenter.selectAll(0);

diylc/diylc-swing/src/main/java/org/diylc/swing/actions/file/ImportNetlistAction.java

@@ -113,7 +113,7 @@ public class ImportNetlistAction extends AbstractAction {
               if (!outputWarnings.isEmpty())
                 ActionFactory.LOG.warn("Component creation produced warnings:\n"
                     + String.join("\n", outputWarnings));
-              plugInPort.pasteComponents(new ComponentTransferable(components), false, false);
+              plugInPort.pasteComponents(new ComponentTransferable(components, "Imported Netlist"), false, false);
             }
           } catch (Exception e) {
             swingUI.showMessage("Could not import netlist file: " + e.getMessage(), "Error",

diylc/diylc-swing/src/main/java/org/diylc/swing/plugins/explorer/ExplorerPane.java

@@ -18,6 +18,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.UUID;
 import java.util.stream.Collectors;
 import javax.swing.AbstractListModel;
 import javax.swing.DefaultListCellRenderer;
@@ -36,6 +37,7 @@ import javax.swing.event.ListSelectionListener;
 
 import org.diylc.common.ComponentType;
 import org.diylc.common.IPlugInPort;
+import org.diylc.core.ComponentGroup;
 import org.diylc.core.IDIYComponent;
 import org.diylc.lang.LangUtil;
 import org.diylc.swing.ISwingUI;
@@ -60,9 +62,10 @@ public class ExplorerPane extends JPanel {
   private JTextField searchField;
   private JScrollPane componentScrollPane;
   private ComponentListModel componentListModel;
-  private JList<IDIYComponent<?>> componentList;
+  private JList<ComponentGroupItem> componentList;
   private ComponentPopupMenu popupMenu;
   private JComboBox<Sort> sortBox;
+  private ListSelectionListener selectionListener;
 
   public ExplorerPane(ISwingUI swingUI, IPlugInPort plugInPort) {
     super();
@@ -144,9 +147,9 @@ public class ExplorerPane extends JPanel {
     return componentScrollPane;
   }
 
-  public JList<IDIYComponent<?>> getComponentList() {
+  public JList<ComponentGroupItem> getComponentList() {
     if (componentList == null) {
-      componentList = new DragDropList<IDIYComponent<?>>(new IDragDropListListener() {
+      componentList = new DragDropList<ComponentGroupItem>(new IDragDropListListener() {
 
         @Override
         public boolean dropComplete(int selectedIndex, int dropTargetIndex) {
@@ -154,7 +157,82 @@ public class ExplorerPane extends JPanel {
             swingUI.showMessage(REORDERING_NOT_POSSIBLE, "Error", ISwingUI.ERROR_MESSAGE);
             return false;
           }
-          plugInPort.moveSelectionToZIndex(getComponentListModel().getSize() - dropTargetIndex);
+          // The list is displayed in reverse order (highest z-index first, index 0 = last in component list)
+          // Component list is in normal order (lowest z-index first, index 0 = first component)
+          // In INSERT mode, dropTargetIndex is where the item will be inserted AFTER removal
+          int listSize = getComponentListModel().getSize();
+          int componentCount = plugInPort.getCurrentProject().getComponents().size();
+          
+          // The list size may be different from component count due to groups
+          // listSize = componentCount - groupedComponents + groups
+          // We need to find which component will be at dropTargetIndex in the final list
+          // and convert that to a component index
+          
+          // Find the ComponentGroupItem that will be at dropTargetIndex after removal
+          // We want to insert before the component that will be at dropTargetIndex after insertion
+          List<ComponentGroupItem> components = getComponentListModel().getComponents();
+          
+          int componentAtTargetListIndex;
+          
+          if (dropTargetIndex >= listSize - 1) {
+            // Dropping at the end
+            plugInPort.moveSelectionToZIndex(componentCount);
+            return true;
+          } else if (selectedIndex < dropTargetIndex) {
+            // Dragging up: removal happens before target
+            // After removal, the component that was at dropTargetIndex is now at dropTargetIndex-1
+            // After insertion at dropTargetIndex, it will be at dropTargetIndex+1
+            // So we want to insert before the component currently at dropTargetIndex
+            componentAtTargetListIndex = dropTargetIndex;
+          } else {
+            // Dragging down: removal happens after target
+            // After removal, the component at dropTargetIndex stays at dropTargetIndex
+            // After insertion at dropTargetIndex, it will be at dropTargetIndex+1
+            // So we want to insert before the component currently at dropTargetIndex
+            componentAtTargetListIndex = dropTargetIndex;
+          }
+          
+          if (componentAtTargetListIndex >= listSize) {
+            // Insert at the end
+            plugInPort.moveSelectionToZIndex(componentCount);
+            return true;
+          }
+          
+          // Get the ComponentGroupItem at that position
+          ComponentGroupItem targetItem = components.get(componentAtTargetListIndex);
+          
+          // Find the highest z-index component in this group (or the component itself if single)
+          // Since the list is sorted by z-index (reversed), this is the component that determines
+          // the position of this group in the list
+          IDIYComponent<?> targetComponent = null;
+          int maxComponentIndex = -1;
+          List<IDIYComponent<?>> allComponents = plugInPort.getCurrentProject().getComponents();
+          
+          for (IDIYComponent<?> comp : targetItem.getGroup()) {
+            int compIndex = allComponents.indexOf(comp);
+            if (compIndex > maxComponentIndex) {
+              maxComponentIndex = compIndex;
+              targetComponent = comp;
+            }
+          }
+          
+          if (targetComponent == null || maxComponentIndex < 0) {
+            return false;
+          }
+          
+          // We want to insert before the component at maxComponentIndex
+          // moveSelectionToZIndex will automatically decrement zIndex for each selected component
+          // that's before the target, so we can use maxComponentIndex directly
+          // However, we need to add 1 because we want to insert at dropTargetIndex, not before it
+          int targetComponentIndex = maxComponentIndex + 1;
+          
+          if (targetComponentIndex < 0) {
+            targetComponentIndex = 0;
+          } else if (targetComponentIndex > componentCount) {
+            targetComponentIndex = componentCount;
+          }
+          
+          plugInPort.moveSelectionToZIndex(targetComponentIndex);
           return true;
         }
       });
@@ -162,20 +240,28 @@ public class ExplorerPane extends JPanel {
       componentList.setFont(DEFAULT_FONT);
       componentList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
       componentList.setCellRenderer(new ComponentListCellRenderer(plugInPort.getComponentTypes()));
-      componentList.addListSelectionListener(new ListSelectionListener() {
+      selectionListener = new ListSelectionListener() {
 
         @Override
         public void valueChanged(ListSelectionEvent e) {
           if (e.getValueIsAdjusting())
             return;
 
-          List<IDIYComponent<?>> selectedValuesList = componentList.getSelectedValuesList();
+          List<ComponentGroupItem> selectedValuesList = componentList.getSelectedValuesList();
-          if (selectedValuesList.size() > 0 && !new HashSet<IDIYComponent<?>>(selectedValuesList)
+          Set<IDIYComponent<?>> expandedSelection = new HashSet<>();
+          
+          for (ComponentGroupItem selected : selectedValuesList) {
+            // Always add all components from the group item
+            expandedSelection.addAll(selected.getGroup());
+          }
+          
+          if (expandedSelection.size() > 0 && !expandedSelection
               .equals(new HashSet<IDIYComponent<?>>(plugInPort.getSelectedComponents()))) {
-            plugInPort.setSelection(selectedValuesList, true);
+            plugInPort.setSelection(expandedSelection, true);
           }
         }
-      });
+      };
+      componentList.addListSelectionListener(selectionListener);
 
       componentList.addMouseListener(new MouseAdapter() {
 
@@ -205,8 +291,13 @@ public class ExplorerPane extends JPanel {
               if (plugInPort.getNewComponentTypeSlot() == null && (e.isPopupTrigger()
                   || (pressedEvent != null && pressedEvent.isPopupTrigger()))) {
 
-                final List<IDIYComponent<?>> selectedValues = componentList.getSelectedValuesList();
+                final List<ComponentGroupItem> selectedValues = componentList.getSelectedValuesList();
-                getComponentPopupMenu().prepareAndShowAt(selectedValues, selectedValues, e.getX(),
+                // Extract actual components from selected items
+                List<IDIYComponent<?>> components = new ArrayList<>();
+                for (ComponentGroupItem item : selectedValues) {
+                  components.addAll(item.getGroup());
+                }
+                getComponentPopupMenu().prepareAndShowAt(components, components, e.getX(),
                     e.getY());
               }
             }
@@ -238,46 +329,105 @@ public class ExplorerPane extends JPanel {
   }
 
   public void setSelection(Set<IDIYComponent<?>> selectedComponents) {
-    List<IDIYComponent<?>> selectedValuesList = componentList.getSelectedValuesList();
+    List<ComponentGroupItem> selectedValuesList = componentList.getSelectedValuesList();
-    if (new HashSet<IDIYComponent<?>>(selectedValuesList)
+    
-        .equals(new HashSet<IDIYComponent<?>>(plugInPort.getSelectedComponents())))
+    // Extract components from selected values
+    Set<IDIYComponent<?>> currentSelected = new HashSet<>();
+    for (ComponentGroupItem item : selectedValuesList) {
+      currentSelected.addAll(item.getGroup());
+    }
+    
+    if (currentSelected.equals(selectedComponents))
       return;
 
-    final JList<IDIYComponent<?>> list = this.getComponentList();
+    final JList<ComponentGroupItem> list = this.getComponentList();
 
-    if (selectedComponents.size() == 0) {
+    // Temporarily remove listener to prevent infinite loop
-      list.clearSelection();
+    list.removeListSelectionListener(selectionListener);
-    } else {
+    try {
+      if (selectedComponents.size() == 0) {
+        list.clearSelection();
+      } else {
+        // Build a map from component to its group (if any)
+        Set<ComponentGroup> groups = plugInPort.getComponentGroups();
+        Map<IDIYComponent<?>, Set<IDIYComponent<?>>> componentToGroup = new java.util.HashMap<>();
+        if (groups != null && !groups.isEmpty()) {
+          // Build a map from UUID to component for quick lookup
+          List<IDIYComponent<?>> allComponents = plugInPort.getCurrentProject().getComponents();
+          Map<UUID, IDIYComponent<?>> idToComponent = allComponents.stream()
+              .collect(Collectors.toMap(IDIYComponent::getId, comp -> comp));
           
-      int[] indices = new int[selectedComponents.size()];
+          for (ComponentGroup group : groups) {
-      int n = 0;
+            // Convert ComponentGroup (with UUIDs) to Set<IDIYComponent<?>>
-      List<IDIYComponent<?>> components = this.getComponentListModel().getComponents();
+            Set<IDIYComponent<?>> componentSet = group.getComponentIds().stream()
-      for (int i = 0; i < components.size(); i++) {
+                .map(idToComponent::get)
-        indices[n] = -1; // this should not happen
+                .filter(java.util.Objects::nonNull)
-        if (selectedComponents.contains(components.get(i)))
+                .collect(Collectors.toSet());
-          indices[n++] = i;
+            
-        if (n == indices.length)
+            for (IDIYComponent<?> component : componentSet) {
-          break;
+              componentToGroup.put(component, componentSet);
+            }
+          }
+        }
+
+        // Find indices of items to select
+        List<ComponentGroupItem> components = this.getComponentListModel().getComponents();
+        Set<Integer> selectedIndices = new HashSet<>();
+        Set<Set<IDIYComponent<?>>> selectedGroups = new HashSet<>();
+        
+        for (IDIYComponent<?> selected : selectedComponents) {
+          Set<IDIYComponent<?>> group = componentToGroup.get(selected);
+          if (group != null) {
+            // Component is in a group
+            if (!selectedGroups.contains(group)) {
+              // Find the ComponentGroupItem for this group
+              for (int i = 0; i < components.size(); i++) {
+                ComponentGroupItem groupItem = components.get(i);
+                if (groupItem.getGroup().equals(group)) {
+                  selectedIndices.add(i);
+                  selectedGroups.add(group);
+                  break;
+                }
+              }
+            }
+          } else {
+            // Component is not in any group, find the ComponentGroupItem that contains only this component
+            for (int i = 0; i < components.size(); i++) {
+              ComponentGroupItem groupItem = components.get(i);
+              if (groupItem.getGroup().size() == 1 && groupItem.getGroup().contains(selected)) {
+                selectedIndices.add(i);
+                break;
+              }
+            }
+          }
+        }
+
+        int[] indices = selectedIndices.stream().mapToInt(i -> i).toArray();
+
+        list.getSelectionModel().setValueIsAdjusting(true);
+        list.setSelectedIndices(indices);
+        list.getSelectionModel().setValueIsAdjusting(false);
+        if (indices.length > 0) {
+          int firstVisibleIndex = list.getFirstVisibleIndex();
+          int lastVisibleIndex = list.getLastVisibleIndex();
+          // if none of the selected items is visible, jump to the first one
+          if (!Arrays.stream(indices)
+              .anyMatch(index -> firstVisibleIndex <= index && index <= lastVisibleIndex))
+            list.ensureIndexIsVisible(indices[0]);
+        }
       }
-
+    } finally {
-      list.getSelectionModel().setValueIsAdjusting(true);
+      // Re-add listener
-      list.setSelectedIndices(indices);
+      list.addListSelectionListener(selectionListener);
-      list.getSelectionModel().setValueIsAdjusting(false);
-      int firstVisibleIndex = list.getFirstVisibleIndex();
-      int lastVisibleIndex = list.getFirstVisibleIndex();
-      // if none of the selected items is visible, jump to the first one
-      if (!Arrays.stream(indices)
-          .anyMatch(index -> firstVisibleIndex <= index && index <= lastVisibleIndex))
-        list.ensureIndexIsVisible(indices[0]);
     }
   }
 
-  private class ComponentListModel extends AbstractListModel<IDIYComponent<?>> {
+  private class ComponentListModel extends AbstractListModel<ComponentGroupItem> {
 
     private static final long serialVersionUID = 1L;
 
     private List<IDIYComponent<?>> componentsRaw;
-    private List<IDIYComponent<?>> components;
+    private List<ComponentGroupItem> components;
 
     private String searchText;
     private Sort sort = Sort.Z_INDEX;
@@ -289,7 +439,7 @@ public class ExplorerPane extends JPanel {
       refresh(oldSize);
     }
 
-    public List<IDIYComponent<?>> getComponents() {
+    public List<ComponentGroupItem> getComponents() {
       return components;
     }
 
@@ -310,27 +460,32 @@ public class ExplorerPane extends JPanel {
     }
 
     private void refresh(int oldSize) {
+      List<IDIYComponent<?>> sortedComponents;
+      
       if (sort == Sort.NAME) {
-        this.components =
+        sortedComponents =
             componentsRaw.stream().sorted(Comparator.comparing(x -> x.toString().toLowerCase()))
                 .collect(Collectors.toList());
       } else if (sort == Sort.TYPE) {
-        this.components = componentsRaw.stream()
+        sortedComponents = componentsRaw.stream()
             .sorted(Comparator.comparing(x -> x.getClass().getName().toLowerCase())
                 .thenComparing(x -> x.toString().toLowerCase()))
             .collect(Collectors.toList());
       } else {
         List<IDIYComponent<?>> componentsClone = new ArrayList<IDIYComponent<?>>(componentsRaw);
         Collections.reverse(componentsClone);
-        this.components = componentsClone;
+        sortedComponents = componentsClone;
       }
 
       if (searchText != null && !searchText.trim().isEmpty()) {
-        this.components = this.components.stream().filter(component -> {
+        sortedComponents = sortedComponents.stream().filter(component -> {
           return component.getName().toLowerCase().contains(searchText);
         }).collect(Collectors.toList());
       }
 
+      // Build list with groups and ungrouped components
+      this.components = buildComponentListWithGroups(sortedComponents);
+
       int newSize = this.components.size();
 
       fireContentsChanged(this, 0, Math.min(newSize, oldSize));
@@ -340,18 +495,79 @@ public class ExplorerPane extends JPanel {
         fireIntervalAdded(this, oldSize, newSize);
     }
     
+    /**
+     * Builds the component list, using ComponentGroupItem for all items.
+     * For grouped components, creates one ComponentGroupItem per group.
+     * For ungrouped components, creates a ComponentGroupItem with a single component.
+     */
+    private List<ComponentGroupItem> buildComponentListWithGroups(List<IDIYComponent<?>> sortedComponents) {
+      Set<ComponentGroup> groups = plugInPort.getComponentGroups();
+      
+      // Build a map from component to its group (if any) and group name
+      Map<IDIYComponent<?>, Set<IDIYComponent<?>>> componentToGroup = new java.util.HashMap<>();
+      Map<Set<IDIYComponent<?>>, String> groupToName = new java.util.HashMap<>();
+      if (groups != null && !groups.isEmpty()) {
+        // Build a map from UUID to component for quick lookup
+        List<IDIYComponent<?>> allComponents = plugInPort.getCurrentProject().getComponents();
+        Map<UUID, IDIYComponent<?>> idToComponent = allComponents.stream()
+            .collect(Collectors.toMap(IDIYComponent::getId, comp -> comp));
+        
+        for (ComponentGroup group : groups) {
+          // Convert ComponentGroup (with UUIDs) to Set<IDIYComponent<?>>
+          Set<IDIYComponent<?>> componentSet = group.getComponentIds().stream()
+              .map(idToComponent::get)
+              .filter(java.util.Objects::nonNull)
+              .collect(Collectors.toSet());
+          
+          for (IDIYComponent<?> component : componentSet) {
+            componentToGroup.put(component, componentSet);
+          }
+          
+          // Store the group name
+          if (group.getName() != null && !group.getName().isEmpty()) {
+            groupToName.put(componentSet, group.getName());
+          }
+        }
+      }
+      
+      // Track which groups we've already added
+      Set<Set<IDIYComponent<?>>> addedGroups = new HashSet<>();
+      List<ComponentGroupItem> result = new ArrayList<>();
+      
+      for (IDIYComponent<?> component : sortedComponents) {
+        Set<IDIYComponent<?>> group = componentToGroup.get(component);
+        if (group == null) {
+          // Component is not in any group, create a ComponentGroupItem with just this component
+          Set<IDIYComponent<?>> singleComponentGroup = new HashSet<>();
+          singleComponentGroup.add(component);
+          result.add(new ComponentGroupItem(singleComponentGroup, null));
+        } else {
+          // Component is in a group
+          if (!addedGroups.contains(group)) {
+            // This is the first component from this group we've seen, add the group item
+            String groupName = groupToName.get(group);
+            result.add(new ComponentGroupItem(group, groupName));
+            addedGroups.add(group);
+          }
+          // Otherwise, skip this component as we already have a group item for it
+        }
+      }
+      
+      return result;
+    }
+
     @Override
     public int getSize() {
       return this.components == null ? 0 : this.components.size();
     }
 
     @Override
-    public IDIYComponent<?> getElementAt(int index) {
+    public ComponentGroupItem getElementAt(int index) {
       return this.components.get(index);
     }
   }
 
-  private static class ComponentListCellRenderer implements ListCellRenderer<IDIYComponent<?>> {
+  private static class ComponentListCellRenderer implements ListCellRenderer<ComponentGroupItem> {
 
     // private static Color[] layerColors = new Color[] { Color.gray, Color.decode("#ff6363"),
     // Color.decode("#293462"), Color.decode("#138588"),
@@ -367,32 +583,70 @@ public class ExplorerPane extends JPanel {
     }
 
     @Override
-    public Component getListCellRendererComponent(JList<? extends IDIYComponent<?>> list,
+    public Component getListCellRendererComponent(JList<? extends ComponentGroupItem> list,
-        IDIYComponent<?> value, int index, boolean isSelected, boolean cellHasFocus) {
+        ComponentGroupItem value, int index, boolean isSelected, boolean cellHasFocus) {
-
-      ComponentType componentType = componentTypes.get(value.getClass().getCanonicalName());
 
       JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, index,
           isSelected, cellHasFocus);
 
-      int layerId = (int) Math.round(componentType.getZOrder());
+      ComponentGroupItem groupItem = value;
       
-      String valueForDisplay = value.getValueForDisplay();
+      if (groupItem.getComponentCount() == 1) {
-      if (isSelected) {
+        // Render as individual component (ungrouped)
-        if (valueForDisplay == null || valueForDisplay.trim().isEmpty()) {
+        IDIYComponent<?> component = groupItem.getGroup().iterator().next();
-          renderer.setText(String.format("[L%s] %s", layerId, value.getName()));
+        ComponentType componentType = componentTypes.get(component.getClass().getCanonicalName());
+        
+        if (componentType == null) {
+          renderer.setText(component.toString());
+          return renderer;
+        }
+
+        int layerId = (int) Math.round(componentType.getZOrder());
+
+        String valueForDisplay = component.getValueForDisplay();
+        if (isSelected) {
+          if (valueForDisplay == null || valueForDisplay.trim().isEmpty()) {
+            renderer.setText(String.format("[L%s] %s", layerId, component.getName()));
+          } else {
+            renderer
+                .setText(String.format("[L%s] %s (%s)", layerId, component.getName(), valueForDisplay));
+          }
         } else {
-          renderer
+          if (valueForDisplay == null || valueForDisplay.trim().isEmpty()) {
-              .setText(String.format("[L%s] %s (%s)", layerId, value.getName(), valueForDisplay));
+            renderer.setText(String.format("<html><font color='#c0c0c0'>[L%s]</font> %s</html>",
+                layerId, component.getName()));
+          } else {
+            renderer.setText(String.format(
+                "<html><font color='#c0c0c0'>[L%s]</font> %s (<font color='#666666'>%s</font>)</html>",
+                layerId, component.getName(), valueForDisplay));
+          }
         }
       } else {
-        if (valueForDisplay == null || valueForDisplay.trim().isEmpty()) {
+        // Render as group
-          renderer.setText(String.format("<html><font color='#c0c0c0'>[L%s]</font> %s</html>",
+        // Calculate maximum layer from components in the group
-              layerId, value.getName()));
+        int maxLayerId = 0;
+        for (IDIYComponent<?> component : groupItem.getGroup()) {
+          ComponentType componentType = componentTypes.get(component.getClass().getCanonicalName());
+          if (componentType != null) {
+            int layerId = (int) Math.round(componentType.getZOrder());
+            if (layerId > maxLayerId) {
+              maxLayerId = layerId;
+            }
+          }
+        }
+        
+        // Format: name (component count), similar to regular components showing name (value)
+        String groupName = groupItem.getGroupName() != null && !groupItem.getGroupName().isEmpty()
+            ? groupItem.getGroupName()
+            : "Group";
+        String componentCount = String.valueOf(groupItem.getComponentCount());
+        
+        if (isSelected) {
+          renderer.setText(String.format("<html>[L%s] <b>%s</b> (<b>%s</b>)</html>", maxLayerId, groupName, componentCount));
         } else {
           renderer.setText(String.format(
               "<html><font color='#c0c0c0'>[L%s]</font> %s (<font color='#666666'>%s</font>)</html>",
-              layerId, value.getName(), valueForDisplay));
+              maxLayerId, groupName, componentCount));
         }
       }
 
@@ -414,4 +668,52 @@ public class ExplorerPane extends JPanel {
       return LangUtil.translate(label);
     }
   }
+  
+  /**
+   * Wrapper class to represent a group of components in the explorer list.
+   */
+  public static class ComponentGroupItem {
+    private final Set<IDIYComponent<?>> group;
+    private final String groupName;
+    
+    public ComponentGroupItem(Set<IDIYComponent<?>> group, String groupName) {
+      this.group = group;
+      this.groupName = groupName;
+    }
+    
+    public Set<IDIYComponent<?>> getGroup() {
+      return group;
+    }
+    
+    public int getComponentCount() {
+      return group.size();
+    }
+    
+    public String getGroupName() {
+      return groupName;
+    }
+    
+    @Override
+    public String toString() {
+      if (groupName != null && !groupName.isEmpty()) {
+        return groupName;
+      }
+      return "Group of " + group.size() + " components";
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+      if (this == obj)
+        return true;
+      if (obj == null || getClass() != obj.getClass())
+        return false;
+      ComponentGroupItem other = (ComponentGroupItem) obj;
+      return group.equals(other.group);
+    }
+    
+    @Override
+    public int hashCode() {
+      return group.hashCode();
+    }
+  }
 }

diylc/pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.diylc</groupId>
     <artifactId>diylc-parent</artifactId>
-    <version>5.8.0</version>
+    <version>5.9.0</version>
     <packaging>pom</packaging>
     
     <name>DIY Layout Creator</name>