public void DropRedirect(object sender, DragEventArgs e)
 {
     if (!IsFolder)
     {
         DragController.Drop(sender, e, HierarchyDragController.DropType.NORMAL);
     }
     else
     {
         DragController.Drop(sender, e, HierarchyDragController.DropType.FOLDER);
     }
 }
 public void DropRedirectSeparator(object sender, DragEventArgs e)
 {
     DragController.Drop(sender, e, HierarchyDragController.DropType.SEPARATOR);
 }