http://bugs.winehq.org/show_bug.cgi?id=25394
--- Comment #7 from Dmitry Timoshkov dmitry@codeweavers.com 2010-12-05 11:22:41 CST --- (In reply to comment #5)
CC Mikolaj, as he's the one who worked most on TB_INSERTBUTTON implementation.
If native comctl32 doesn't help that's not related then.