[RESOLVED] Menu and popup menu can't use the same menu item?

[Emerald214]

Hi, I'm trying to do this: "fileMenu" and "popupMenu" use the same menu item, but it didn't show correctly. When I add redMenuItem to popupMenu, redMenuItem disappears in fileMenu.
Please help me.
Thanks.

package gui2;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPopupMenu;
import javax.swing.JRadioButtonMenuItem;

public class AFrame extends JFrame {
	private JRadioButtonMenuItem redMenuItem;
	private JMenu fileMenu;
	private JMenuBar bar;
	private JPopupMenu popupMenu;
	
	public AFrame()
	{
		super("Test");
		
		bar = new JMenuBar();
		fileMenu = new JMenu("File");
		redMenuItem = new JRadioButtonMenuItem("Red");
		popupMenu = new JPopupMenu();
		
		fileMenu.add(redMenuItem);
		bar.add(fileMenu);
		setJMenuBar(bar);
		
		popupMenu.add(redMenuItem); // if comment out this line,
								     // redMenuItem will appear in file menu.
								   // if uncomment out this line, 
								    // redMenuItem will disappear in file menu.									   
		
		addMouseListener(new MouseAdapter()
			{
				public void mousePressed(MouseEvent e) {
					checkForPopupTrigger(e);
				}

				public void mouseReleased(MouseEvent e) {
					checkForPopupTrigger(e);
				}
				
				private void checkForPopupTrigger(MouseEvent e)
				{
					if(e.isPopupTrigger())
						popupMenu.show(e.getComponent(), e.getX(), e.getY());
				}
			}
		);		
	}
	
	public static void main(String[] args) {
		AFrame app = new AFrame();
		app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		app.setSize(500, 500);
		app.setLocation(300, 200);
		app.setVisible(true);
	}
}