question: private void handleExitMessage ( final Component component , final long nativeCtxt ) { postDropTargetEvent ( component , 0 , 0 , DnDConstants . ACTION_NONE , DnDConstants . ACTION_NONE , null , nativeCtxt , SunDropTargetEvent . MOUSE_EXITED , SunDropTargetContextPeer . DISPATCH_SYNC ) ; }
target:  upcall to handle exit messages