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copied!<p>The ItemContainerGenerator will start generating after the Expanded event, so you can use that to set the Cursor, and set it back once <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.itemcontainergenerator.statuschanged(VS.85).aspx" rel="noreferrer">ItemContainerGenerator.StatusChanged</a> fires to indicate that your children have been populated.</p> <p>Since <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.treeviewitem.expanded(VS.85).aspx" rel="noreferrer">TreeViewItem.Expanded</a> is a routed event, you can just subscribe at some parent level:</p> <pre><code>myTreeView.AddHandler(TreeViewItem.ExpandedEvent, new RoutedEventHandler(TreeViewItemExpanded)); </code></pre> <p>Where TreeViewItemExpanded is defined elsewhere, something like this:</p> <pre><code>private void TreeViewItemExpanded(object sender, RoutedEventArgs e) { // we will only go through with this if our children haven't been populated TreeViewItem sourceItem = e.OriginalSource as TreeViewItem; if ((sourceItem != null) && (sourceItem.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)) { // create a handler that will check our children and reset the cursor when the ItemContainerGenerator has finished EventHandler itemsGenerated = null; DateTime before = DateTime.Now; itemsGenerated = delegate(object o, EventArgs args) { // if the children are done being generated... if ((o as ItemContainerGenerator).Status == GeneratorStatus.ContainersGenerated) { (o as ItemContainerGenerator).StatusChanged -= itemsGenerated; // we're done, so remove the handler sourceItem.Dispatcher.BeginInvoke(DispatcherPriority.DataBind, (ThreadStart)delegate // asynchronous reset of cursor { myWindow.Cursor = Cursors.Arrow; // reset cursor Debug.WriteLine("Expanded in " + (DateTime.Now - before)); }); } }; sourceItem.ItemContainerGenerator.StatusChanged += itemsGenerated; // add the handler myWindow.Cursor = Cursors.Wait; // wait cursor } e.Handled = true; } </code></pre>

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