public void UnselectAllExceptOf(ExtendedTreeViewItem treeViewItem)
{
var containers = this.GetItemContainers();
containers.Remove(treeViewItem);
containers.ForEach(p => p.IsSelected = false);
// Notwendig für Drag and Drop, da Element nicht existiert, während es wechselt
this.SelectedItems = new ExtendedObservableCollection <object>();
var containersToUpdate2 = (from p in this.GetItemContainers()
where p == treeViewItem
select p).ToList();
containersToUpdate2.ForEach(p => p.Focus());
}
public static object GetItemFromContainer(this ExtendedTreeView treeView, ExtendedTreeViewItem item)
{
return(item.DataContext);
}