JMenu hides behind components

[Barry Andrews]

Has anyone ever seen this? I just have a JFrame with a JMenuBar set on it with JFrame.setJMenuBar() method. The JFrame is using a JPanel with layout set to null, then I am just hardcoding the x,y,w,h with setBounds() method on each component. When I drop the menu down, it shows behind a checkbox, i.e. the checkbox hides it. I think this is very odd. If anyone has seen this before, I would like to hear.
Many thanks,
Barry

[Nathan Pruett]

Make sure the checkbox is a Swing JCheckBox, and not an AWT Checkbox... heavyweight and lightweight components don't play together well...

[Barry Andrews]

I am using all swing components. No awt.

[Nathan Pruett]

Look at this example... how does it compare with what's happening in your code...

import javax.swing.*;
import java.awt.*;
 
public class LightweightTest extends JFrame {
 
    public LightweightTest() {
        JMenuBar menuBar = new JMenuBar();
        JMenu menu = new JMenu( "Menu" );
        menuBar.add( menu );
        for ( int i = 0; i < 10; i++ ) {
            menu.add( new JMenuItem( "MenuItem " + i ) );
        }
        setJMenuBar( menuBar );
        JPanel p = new JPanel();
        p.setLayout( null );
        JCheckBox jcb = new JCheckBox( "Swing Checkbox" );
        jcb.setBounds( 10, 10, 120, 20 );
        Checkbox acb = new Checkbox( "AWT Checkbox" );
        acb.setBounds( 10, 30, 120, 20 );
        p.add( acb );
        p.add( jcb );
        getContentPane().add( p );
    }
 
    public static void main( String[] args ) {
        JFrame f = new LightweightTest();
        f.setDefaultCloseOperation( WindowConstants.EXIT_ON_CLOSE );
        f.setSize( 300, 300 );
        f.show();
    }
}

[Barry Andrews]

Oops!!! Sorry, yes I am using awt for the checkbox. I didn't mean to do that. I forgot to put the prefix J. Thanks for your help!!

Barry