enableEvents(AWTEvent.MOUSE_EVENT_MASK);
enableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
  public synchronized void addMouseMotionListener(MouseMotionListener listener)  {    mouseMotionListener = AWTEventMulticaster.add(mouseMotionListener, listener);		if (mouseMotionListener != null)			enableEvents(AWTEvent.MOUSE_EVENT_MASK);	}