Q: I've set the com.apple.macos.useScreenMenuBar property to bring my JMenuBar to the top of the screen, as illustrated in , but now my JCheckBoxMenuItems fire twice when selected.

A: This is a known issue which can be worked around using JRadioButtonMenuItems that have been created with the JCheckBoxMenuItem checkmark, as set in the Swing UIManager. Note that it is important to re-set the global icon for JRadioButtonMenuItems when you are done creating your checkbox "impersonator" so that you can continue to use normal JRadioButtonMenuItems.

Listing 1 shows some code that creates three menu items. The second item (radio2) demonstrates the simulation of a JCheckBoxMenuItem, while the first and third items demonstrate how you can still use regular JRadioButtonMenuItems in conjunction with the workaround. If you discover this problem with menu items other than JCheckBoxMenuItem, please file a bug report.

String RADIO_ICON_KEY = "RadioButtonMenuItem.checkIcon"String CHECK_ICON_KEY = "CheckBoxMenuItem.checkIcon"JRadioButtonMenuItem radio1, radio2, radio3;

// Normal JRadioButtonMenuItem
radio1 = new JRadioButtonMenuItem("Radio Icon");

// Store the default JRBMI icon to put back later
Object radioIcon = UIManager.get(RADIO_ICON_KEY);

// Replace JRBMI's checkIcon with that of JCheckBoxMenuItem
// radio2 should look like a JCBMI
UIManager.put(RADIO_ICON_KEY, UIManager.get(CHECK_ICON_KEY));
JRadioButtonMenuItem radio2 = new JRadioButtonMenuItem("Check Icon");

// Put original JRBMI checkIcon back.
UIManager.put(RADIO_ICON_KEY, radioIcon);

// radio3 should now have the JRBMI icon
radio3 = new JRadioButtonMenuItem("Radio Icon");

[Jul 12 2002]

Developer Documentation | Technical Notes | Development Kits | Sample Code