Problems:
- Some menubar parts (not menu) may be not repainted well
- Mouse movement on menubar can't activate other menus, you have to click or use the old x-window/mac style (press button until you select the target item)
- When you move mouse pointer to menus, it's treated as the mouse has left menubar. No way to solve this, swing sucks...
- You can always move/resize the menubar by Alt+mouse buttons.....