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diff --git a/offapi/com/sun/star/awt/tree/XTreeExpansionListener.idl b/offapi/com/sun/star/awt/tree/XTreeExpansionListener.idl
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+++ b/offapi/com/sun/star/awt/tree/XTreeExpansionListener.idl
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef __com_sun_star_awt_tree_XTreeExpansionListener_idl__
+#define __com_sun_star_awt_tree_XTreeExpansionListener_idl__
+
+#include <com/sun/star/lang/XEventListener.idl>
+
+#include <com/sun/star/awt/tree/TreeExpansionEvent.idl>
+#include <com/sun/star/awt/tree/ExpandVetoException.idl>
+
+
+module com {  module sun {  module star {  module awt {  module tree {
+
+
+/** An instance of this interface can get notifications from a TreeControl
+    when nodes are expanded or collapsed.
+
+    @see XTreeControl::addTreeExpansionListener
+    @see XTreeControl::removeTreeExpansionListener
+ */
+interface XTreeExpansionListener: com::sun::star::lang::XEventListener
+{
+    /** Invoked when a node with children on demand is about to be expanded.
+
+        <p>This event is invoked before the treeExpanding()
+        event.</p>
+    */
+    void requestChildNodes( [in] TreeExpansionEvent Event );
+
+    /** Invoked whenever a node in the tree is about to be expanded.
+
+        @throws ExpandVetoException
+            to notify the calling XTreeControl that expanding
+            TreeExpansionEvent::Node should fail.
+    */
+    void treeExpanding( [in] TreeExpansionEvent Event )
+        raises ( ExpandVetoException );
+
+    /** Invoked whenever a node in the tree is about to be collapsed.
+
+        @throws ExpandVetoException
+            to notify the calling XTreeControl that collapsing
+            TreeExpansionEvent::Node should fail.
+    */
+    void treeCollapsing( [in] TreeExpansionEvent Event )
+        raises ( ExpandVetoException );
+
+    /** Called whenever a node in the tree has been successfully expanded. */
+    void treeExpanded( [in] TreeExpansionEvent Event );
+
+    /** Called whenever a node in the tree has been successfully collapsed. */
+    void treeCollapsed( [in] TreeExpansionEvent Event );
+};
+
+
+}; }; }; }; };
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */