Thread: JMenu disappears when JRadioButtons or JCheckBoxes are used

I have created a JMenuBar with a Pizza JMenu. The JMenu has a 3 JRadioButtons and 2 JCheckBoxes that are appear when menuItems are scrolled over. The problem is that when I click on a JRadioButton or JCheckBox, the whole menu disappears. Is there a particular method or any other way I can stop this from happening?

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class MenuExamplePizza extends JFrame
{
	private JMenuBar menuBar;
	private JMenu menu, sizeMenu, extrasMenu, helpMenu;
	private JMenuItem menuItem;
	private JRadioButtonMenuItem smallrbMenuItem, medrbMenuItem, largerbMenuItem;
	private JCheckBoxMenuItem peppchMenuItem, anchMenuItem;
 
	public MenuExamplePizza()                                       						// Default Constructor
	{
	   menuBar = new JMenuBar();																		//Create the menu bar
 
		menu = new JMenu("Pizza");																		//Build the first menu
		menu.setMnemonic('P');
		menu.getAccessibleContext().setAccessibleDescription("The only menu in this program that has menu items");
		menuBar.add(menu);
 
		menuItem = new JMenuItem("Total");
		menuItem.setMnemonic('T');
		menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_T, ActionEvent.CTRL_MASK));
		menuItem.getAccessibleContext().setAccessibleDescription("This doesn't really do anything");
		menu.add(menuItem);
		menu.addSeparator();
 
		sizeMenu = new JMenu("Size");
		sizeMenu.setMnemonic('S');
		ButtonGroup group = new ButtonGroup();
		smallrbMenuItem = new JRadioButtonMenuItem("Small");
		group.add(smallrbMenuItem);
		sizeMenu.add(smallrbMenuItem);
		medrbMenuItem = new JRadioButtonMenuItem("Medium");
		group.add(medrbMenuItem);
		sizeMenu.add(medrbMenuItem);
		largerbMenuItem = new JRadioButtonMenuItem("Large");
		group.add(largerbMenuItem);
		sizeMenu.add(largerbMenuItem);
		menu.add(sizeMenu);
 
		extrasMenu = new JMenu("Extras");
		extrasMenu.setMnemonic('E');
		peppchMenuItem = new JCheckBoxMenuItem("Pepperoni");
		extrasMenu.add(peppchMenuItem);
		anchMenuItem = new JCheckBoxMenuItem("Anchovies");
		extrasMenu.add(anchMenuItem);
		menu.add(extrasMenu);
 
		menu.addSeparator();																		// a group of radio button menu items																		
 
		menuItem = new JMenuItem("Exit");
		menuItem.setMnemonic('x');
		menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.CTRL_MASK));
		menuItem.getAccessibleContext().setAccessibleDescription("This doesn't really do anything");
		menu.add(menuItem);
 
		helpMenu = new JMenu("Help");															//Build second menu in the menu bar.
 
		menuBar.add(menu);
		menuBar.add(helpMenu);
		add(menuBar);
		setJMenuBar(menuBar);
	}
 
	public static void main(String[] args) 
   {
	   MenuExamplePizza frame = new MenuExamplePizza();
	   frame.setTitle("Pizza Menu");
	   frame.setSize(300, 250);
	   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	   frame.setLocationRelativeTo(null);	 
	   frame.setVisible(true);
	}
}

Yes that's it

But I don't want the menu to close when I click something, I want it to stay open, how would I do this?