diff -r 14dc2103a631 -r ed1c9f64298a trace/tracebuilder/com.nokia.tracebuilder/src/com/nokia/tracebuilder/model/TraceModelExtensionListener.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trace/tracebuilder/com.nokia.tracebuilder/src/com/nokia/tracebuilder/model/TraceModelExtensionListener.java	Wed Jun 23 14:35:40 2010 +0300
@@ -0,0 +1,48 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+*
+* Listener interface for trace model extension notifications
+*
+*/
+package com.nokia.tracebuilder.model;
+
+/**
+ * Listener interface for trace model extension notifications
+ * 
+ */
+public interface TraceModelExtensionListener {
+
+	/**
+	 * Notifies that an extension was added to the trace object
+	 * 
+	 * @param object
+	 *            the object where the extension was added
+	 * @param extension
+	 *            the new extension object
+	 */
+	public void extensionAdded(TraceObject object, TraceModelExtension extension);
+
+	/**
+	 * Notifies that an extension was removed from the trace object
+	 * 
+	 * @param object
+	 *            the object from where the extension was removed
+	 * @param extension
+	 *            the removed extension object
+	 */
+	public void extensionRemoved(TraceObject object,
+			TraceModelExtension extension);
+
+}