public static class TreeViewHelper
{
private static Dictionary<ItemContainerGenerator, AutoResetEvent> _waiters = new Dictionary<ItemContainerGenerator, AutoResetEvent>();
public static void SelectedAndExpand(this RadTreeView thisTreeView, object toSelect)
{
// Set the selectedItem, collapse all and desactivate animations
thisTreeView.SelectedItem = toSelect;
thisTreeView.CollapseAll();
AnimationManager.IsGlobalAnimationEnabled = false;
// Lauch background worker to not stop the UI thread when waiting for the ItemContainerGenerator
var worker = new BackgroundWorker() { WorkerSupportsCancellation = false, WorkerReportsProgress = false };
worker.DoWork += delegate
{
thisTreeView.Dispatcher.BeginInvoke(() => ExpandToObject(thisTreeView, toSelect));
};
worker.RunWorkerAsync();
worker.RunWorkerCompleted += delegate
{
AnimationManager.IsGlobalAnimationEnabled = true;
};
}
private static void CheckContainerGeneratorBuzy(this ItemContainerGenerator generator)
{
if (generator != null && generator.Status != GeneratorStatus.ContainersGenerated)
{
generator.StatusChanged -= ItemContainerGeneratorChanged;
generator.StatusChanged += ItemContainerGeneratorChanged;
if (!_waiters.ContainsKey(generator))
_waiters.Add(generator, new AutoResetEvent(false));
_waiters[generator].WaitOne();
}
}
private static void ItemContainerGeneratorChanged(object sender, System.EventArgs e)
{
var generator = sender as ItemContainerGenerator;
if (generator != null && generator.Status == GeneratorStatus.ContainersGenerated)
{
generator.StatusChanged -= ItemContainerGeneratorChanged;
_waiters[generator].Set();
}
}
private static bool ExpandToObject(ItemsControl control, object toFind)
{
bool retval = false;
for (int i = 0; i < control.Items.Count; i++)
{
// Wait for the ContainersGenerated
control.ItemContainerGenerator.CheckContainerGeneratorBuzy();
// Foreach item find container
var visualItem = control.ItemContainerGenerator.ContainerFromIndex(i) as RadTreeViewItem;
if (visualItem != null)
{
if (!visualItem.IsExpanded)
{
// Expand causes creation of children items
// if not ContainerFromIndex will be null
visualItem.IsExpanded = true;
visualItem.UpdateLayout();
}
if (visualItem.DataContext == toFind)
{
// Verify DataContext of item
retval = true;
visualItem.IsExpanded = false;
}
if (!retval)
{
// Recurcivity to children
if (visualItem.Items.Count > 0)
retval = ExpandToObject(visualItem, toFind);
}
if (!retval)
// If the branch no contain item, collapse it
visualItem.IsExpanded = false;
else
break;
}
}
return retval;
}
}
Hope this code help anyone ...