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