In the Windows look&feel, on JInternalFrame a menubar/menu-button is being
used to implement the frame's menu (in upper left). There are two problems
with this:
1) Now that rollover is enabled, the visuals of the menu button are
   obliterating the underling icon
2) It *should* be a PopupMenu (rather than a pulldown menubar menu).
   because it's a regular pulldown menu, it's slide animation effect is
   not correct - it slides down vertically instead of sliding down-right
   diagonally (as they do on native windows).