This event is fired on the drag source when a drag with the move action is successfully completed. The signal handler is responsible for deleting the data that has been dropped. What "delete" means, depends on the context of the drag operation.
WARNING ! This event should not be mapped when using the Concept Framework, not beeing entirely supproted.You may choose the friendlier way by using the DragData property.
Return value:
This event can close the application by returning MSG_APPLICATION_QUIT. Any other return value will be ignored.