Obscured Menu

I want to add a menubar to the JFrame containing my 3D display. The problem is that the menus are obscured by the 3D plot. I can click and drag on the menu and verify that the menu items do indeed work--they are just invisible. When I don't add my display to the frame, the menubar and items showed up properly. Is there a way to have a menubar coexist with a display in a JFrame?