In case you have missed it, Calvin Hsia has posted a workaround for the problem with menu items and combo boxes not refreshing under Vista.

http://blogs.msdn.com/calvin_hsia/archive/2007/04/26/foxpro-menu-items-combo-boxes-not-refreshing-selected-item-under-aero-in-vista.aspx

He also has more information on the borders not painting correctly:
http://blogs.msdn.com/calvin_hsia/archive/2007/04/27/fix-your-forms-to-paint-borders-correctly-under-vista-aero.aspx