Step to reproduce:
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1) Run the attached program
2) Click on the Menu 'Menu1'. You will see menuItem.
3) Move the mouse on menu 'SubMenu1:3'. you will see menuItem like 'SubMenu1:3:0' etc. move the mouse on some of the menuItems.
4) Move the mouse on menu 'SubMenu1:5'. you will see menuItem like SubMenu1:5:0' etc .Mouvethe mouse on some of the MenuItems.

You will see some painting is not happend properly after 'SubMenu1:3:0' & arrow 'SubMenu1:5:0'. If you see the same then the bug is reproduce.

I have attached a screen shots of the same. I tested this on Vista beta2 (build 5342) on Mustang b81.