new MyListener().add();

    }

    private static class MyListener implements java.awt.event.AWTEventListener {

        public MyListener() {

        }

        public void add() {

            Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.HIERARCHY_EVENT_MASK);

        }

        public void remove() {

            Toolkit.getDefaultToolkit().removeAWTEventListener(this);

        }

        public void eventDispatched(AWTEvent event) {

        }