private void clearEventsWidthOutParent()
{
clearEvent(ref mHandleStartDrag, EventType.StartDrag);
clearEvent(ref mHandleRequestDrop, EventType.RequestDrop);
clearEvent(ref mHandleDropResult, EventType.DropResult);
clearEvent(ref mHandleChangeDDState, EventType.ChangeDDState);
clearEvent(ref mHandleDragWidgetInfo, EventType.RequestDragWidgetInfo);
}