http://bugs.winehq.org/show_bug.cgi?id=24903
--- Comment #7 from Henri Verbeet hverbeet@gmail.com 2010-11-01 09:30:54 CDT --- Created an attachment (id=31648) --> (http://bugs.winehq.org/attachment.cgi?id=31648) patch
Looks like the application replaces the window proc after we put ours in place, and calls it directly instead of using CallWindowProc(). Does the attached patch help?