Java3D in a frame with a Menu?

Hi all!!

I use java3d and show the scene in a frame. My problem is if i give the frame a menu the scene overlaps the open menu so that the menu is not visible. The same problem is that the scene also overlaps other frames even if the frame is not selected. How could i solve that?

Thank you very much!!!

JPopupMenu.setDefaultLightWeightPopupEnabled(false);

http://java.sun.com/products/jfc/tsc/articles/mixing/