Index: compare/org/eclipse/compare/internal/CompareNavigator.java
===================================================================
RCS file: /home/eclipse/org.eclipse.compare/compare/org/eclipse/compare/internal/CompareNavigator.java,v
retrieving revision 1.12
diff -u -r1.12 CompareNavigator.java
--- compare/org/eclipse/compare/internal/CompareNavigator.java	31 May 2002 12:54:00 -0000	1.12
+++ compare/org/eclipse/compare/internal/CompareNavigator.java	17 Jun 2002 09:03:03 -0000
@@ -24,6 +24,7 @@
 	
 	private boolean fLastDirection= true;
 	private CompareViewerSwitchingPane[] fPanes;
+	private boolean fNextFirstTime= true;
 	
 	public CompareNavigator(CompareViewerSwitchingPane[] panes) {
 		fPanes= panes;
@@ -36,6 +37,11 @@
 	public void selectChange(boolean next) {
 		
 		fLastDirection= next;
+
+		if (next && fNextFirstTime) {
+			fNextFirstTime= false;
+			openElement();
+		}
 		
 		// find most down stream CompareViewerPane
 		int n= 0;
@@ -119,4 +125,30 @@
 			return nav.resetDirection();
 		return true;
 	}
+	
+	private void openElement() {
+		if (fPanes == null || fPanes.length == 0)
+			return;
+		IOpenable openable= getOpenable(fPanes[0]);
+		if (openable != null) {
+			openable.openSelected();
+		}
+	}
+	
+	private static IOpenable getOpenable(CompareViewerSwitchingPane pane) {
+		if (pane == null)
+			return null;
+		if (pane.isEmpty())
+			return null;
+		Viewer viewer= pane.getViewer();
+		if (viewer == null)
+			return null;
+		Control control= viewer.getControl();
+		if (control == null)
+			return null;
+		Object data= control.getData(IOpenable.OPENABLE_PROPERTY);
+		if (data instanceof IOpenable)
+			return (IOpenable) data;
+		return null;
+	}	
 }
Index: compare/org/eclipse/compare/internal/IOpenable.java
===================================================================
RCS file: compare/org/eclipse/compare/internal/IOpenable.java
diff -N compare/org/eclipse/compare/internal/IOpenable.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ compare/org/eclipse/compare/internal/IOpenable.java	17 Jun 2002 09:03:03 -0000
@@ -0,0 +1,21 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2002 International Business Machines Corp. and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v0.5 
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v05.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ ******************************************************************************/
+package org.eclipse.compare.internal;
+
+public interface IOpenable {
+	
+	static final String OPENABLE_PROPERTY= "org.eclipse.compare.internal.Openable"; //$NON-NLS-1$
+	
+	/**
+	 * Opens the selected element
+	 */
+	void openSelected();
+}
Index: compare/org/eclipse/compare/structuremergeviewer/DiffTreeViewer.java
===================================================================
RCS file: /home/eclipse/org.eclipse.compare/compare/org/eclipse/compare/structuremergeviewer/DiffTreeViewer.java,v
retrieving revision 1.26
diff -u -r1.26 DiffTreeViewer.java
--- compare/org/eclipse/compare/structuremergeviewer/DiffTreeViewer.java	1 Jun 2002 10:00:00 -0000	1.26
+++ compare/org/eclipse/compare/structuremergeviewer/DiffTreeViewer.java	17 Jun 2002 09:03:03 -0000
@@ -175,11 +175,18 @@
 		
 		INavigatable nav= new INavigatable() {
 			public boolean gotoDifference(boolean next) {
-				return internalNavigate(next);
+				return internalNavigate(next, true);
 			}
 		};
 		tree.setData(INavigatable.NAVIGATOR_PROPERTY, nav);
 		
+		IOpenable openable= new IOpenable() {
+			public void openSelected() {
+				internalOpen();
+			}
+		};
+		tree.setData(IOpenable.OPENABLE_PROPERTY, openable);
+		
 		fLeftIsLocal= Utilities.getBoolean(configuration, "LEFT_IS_LOCAL", false); //$NON-NLS-1$
 
 		tree.setData(CompareUI.COMPARE_VIEWER_TITLE, getTitle());
@@ -498,7 +505,7 @@
 	 * @param next if <code>true</code> the next node is selected, otherwise the previous node
 	 */
 	protected void navigate(boolean next) {	
-		internalNavigate(next);
+		internalNavigate(next, false);
 	}
 	
 	//---- private
@@ -512,7 +519,7 @@
 	 * @param next if <code>true</code> the next node is selected, otherwise the previous node
 	 * @return <code>true</code> if at end (or beginning)
 	 */
-	private boolean internalNavigate(boolean next) {
+	private boolean internalNavigate(boolean next, boolean open) {
 		
 		Control c= getControl();
 		if (!(c instanceof Tree))
@@ -528,7 +535,7 @@
 			if (children != null && children.length > 0) {
 				item= children[0];
 				if (item != null && item.getItemCount() <= 0) {
-					internalSetSelection(item);
+					internalSetSelection(item, open);
 					return false;
 				}
 			}
@@ -543,7 +550,7 @@
 		}
 		
 		if (item != null) {
-			internalSetSelection(item);
+			internalSetSelection(item, open);
 			return false;
 		}
 		return true;
@@ -632,11 +639,16 @@
 		return item;
 	}
 	
-	private void internalSetSelection(TreeItem ti) {
+	private void internalSetSelection(TreeItem ti, boolean open) {
 		if (ti != null) {
 			Object data= ti.getData();
-			if (data != null)
-				setSelection(new StructuredSelection(data), true);
+			if (data != null) {
+				ISelection selection= new StructuredSelection(data);
+				setSelection(selection, true);
+				if (open && selection.equals(getSelection())) {
+					fireOpen(new OpenEvent(this, selection));
+				}
+			}
 		}
 	}
 	
@@ -703,6 +715,13 @@
 			fCopyLeftToRightAction.setEnabled(leftToRight > 0);
 		if (fCopyRightToLeftAction != null)
 			fCopyRightToLeftAction.setEnabled(rightToLeft > 0);
+	}
+	
+	private void internalOpen()  {
+		ISelection selection= getSelection();
+		if (selection != null && !selection.isEmpty()) {
+			fireOpen(new OpenEvent(this, selection));
+		}
 	}
 }