//DraggingStates
private void CreateDraggingClone(FrameworkElement refItem)
{
if (draggingClone != null)
{
return;
}
draggingClone = (FrameworkElement)Activator.CreateInstance(pressedItem.GetType());
draggingClone.IsHitTestVisible = false;
draggingClone.VerticalAlignment = VerticalAlignment.Top;
((ITreeItem)draggingClone).SetDisplayName(((ITreeItem)refItem).DisplayName);
ContentGrid.Children.Add(draggingClone);
}