Class Roo.dd.DropTarget.*drop
The function a {link Roo.dd.DragSource} calls once to notify this drop target that the dragged item has
been dropped on it. This method has no default implementation and returns false, so you must provide an
implementation that does something to process the drop event and returns true so that the drag source's
repair action does not run.
IMPORTANT : it should set this.success
Config Options - Has None
Public Properties - Has None
Public Methods - Has None