diff --git a/diylc/diylc-core/src/org/diylc/presenter/update.xml b/diylc/diylc-core/src/org/diylc/presenter/update.xml
index 735138eb..714a53b1 100644
--- a/diylc/diylc-core/src/org/diylc/presenter/update.xml
+++ b/diylc/diylc-core/src/org/diylc/presenter/update.xml
@@ -3493,7 +3493,11 @@
 				<org.diylc.appframework.update.Change>
 					<changeType>NEW_FEATURE</changeType>
 					<description>When editing component colors, honor the specified 'alpha' value specified on each color individually in addition to the component-level alpha property</description>
-				</org.diylc.appframework.update.Change>			
+				</org.diylc.appframework.update.Change>	
+				<org.diylc.appframework.update.Change>
+					<changeType>IMPROVEMENT</changeType>
+					<description>Single click to expand and collapse categories in the component tree</description>
+				</org.diylc.appframework.update.Change>		
 				<org.diylc.appframework.update.Change>
 					<changeType>IMPROVEMENT</changeType>
 					<description>Improved code robustness</description>
diff --git a/diylc/diylc-swing/src/org/diylc/swing/plugins/tree/TreePanel.java b/diylc/diylc-swing/src/org/diylc/swing/plugins/tree/TreePanel.java
index b870eda4..161b120a 100644
--- a/diylc/diylc-swing/src/org/diylc/swing/plugins/tree/TreePanel.java
+++ b/diylc/diylc-swing/src/org/diylc/swing/plugins/tree/TreePanel.java
@@ -196,6 +196,7 @@ public class TreePanel extends JPanel {
       tree.setCellRenderer(new ComponentCellRenderer());
       tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
       tree.setRowHeight(0);
+      tree.setToggleClickCount(1);
       ToolTipManager.sharedInstance().registerComponent(tree);
 
       tree.addTreeSelectionListener(new TreeSelectionListener() {