Painting is not happening properly on menu , when frame containing menubar is resized. And switched over to any native application (Notepad) i,e the user can see only menus. The bottom border of the frame should touch some of the menu fonts atleast edge of the fonts. I have attached a screen shots of this problem.

Step to reproduce:
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1) Run the attached program.
2) Resize the frame, so that the bottom border of the frame should touch fonts of the menu.
3) Open notepad.
4) Place both , frame & notepad next to each other.
5) Select the frame, & Press F10 , you can see 'Menu0' is highlighted or selected & the bottom border of the frame is painted with color of the menu(brown). You can see the last image in the attached screen shot.
5) switch between frame & notepad slowly for 10 to 15 times .You will see the frame get any one of the state which is shown in the attached screen shot file.

I tested this with Mustang till b76 & Tiger RC b63 & its reproducable.