http://bugs.winehq.org/show_bug.cgi?id=18738
--- Comment #1 from Nikolay Sivov bunglehead@gmail.com 2009-06-02 11:06:05 --- Hi, it uses user32 combobox so it could be a propertysheet problem if native comctl32 helps.
Could you please provide to traces as separate attachments: +combo and +propsheet. Just closing on this tab should be enough.