bool InternalBanDrop(int insertRowHandle, TreeListNode insertNode, DragDropManagerBase sourceManager) {
if(ReferenceEquals(this, sourceManager))
foreach(TreeListNode node in sourceManager.DraggingRows) {
if(ReferenceEquals(insertNode, node) || (insertNode!=null && insertNode.IsDescendantOf(node)))
return true;
}
return false;
}