How to add MouseListener to Popup of JComboBox?

It's not easy.. see below for how

import java.lang.reflect.InvocationTargetException;
import java.awt.event.MouseAdapter;
import java.lang.reflect.Field;
import javax.swing.*;
import javax.swing.plaf.basic.BasicComboPopup;
import javax.swing.plaf.basic.BasicComboBoxUI;
import java.awt.event.MouseEvent;

/**
 * User: destiny
 * Date: Oct 19, 2009
 * Time: 9:18:34 PM
 */
public class JComboPopupMouseListenerDemo {

    private static void addPopupMouseListener(JComboBox box) {
        try {
                  Field popupInBasicComboBoxUI = BasicComboBoxUI.class.getDeclaredField("popup");
                popupInBasicComboBoxUI.setAccessible(true);
                BasicComboPopup popup = (BasicComboPopup) popupInBasicComboBoxUI.get(box.getUI());

                Field scrollerInBasicComboPopup = BasicComboPopup.class.getDeclaredField("scroller");
                scrollerInBasicComboPopup.setAccessible(true);
                JScrollPane scroller = (JScrollPane) scrollerInBasicComboPopup.get(popup);

                scroller.getViewport().getView().addMouseListener(this);
//                ((JViewport) ((JScrollPane) ((BasicComboPopup) popupInBasicComboBoxUI.get(box.getUI())).getComponents()[0]).getComponents()[0]).getComponents()[0].addMouseListener(this);
        }
        catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
        catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }

    private static MouseAdapter listener() {
        return new MouseAdapter(){
            public void mouseClicked(MouseEvent mouseEvent) {
                System.out.println("mouseClicked");
            }

            public void mousePressed(MouseEvent mouseEvent) {
                System.out.println("mousePressed");
            }

            public void mouseReleased(MouseEvent mouseEvent) {
                System.out.println("mouseReleased");
            }

            public void mouseEntered(MouseEvent mouseEvent) {
                System.out.println("mouseEntered");
            }

            public void mouseExited(MouseEvent mouseEvent) {
                System.out.println("mouseExited");
            }
        };
    }

    public static void main(String[] args) throws InvocationTargetException, InterruptedException {
        JComboBox box = new JComboBox(new String[]{"val 1","val 2","val ......","val 4","val 5","val 6"});
        box.setEditable(true);
        addPopupMouseListener(box);

        JFrame frame = new JFrame();
        frame.add(box);
        frame.pack();
        frame.setVisible(true);
    }
}