http://bugs.winehq.org/show_bug.cgi?id=13217
--- Comment #9 from Dmitry Timoshkov dmitry@codeweavers.com 2008-08-22 23:07:36 --- (In reply to comment #8)
Tested Wine 1.1.3 and FL Studio 8 behavior is the same as comment #6 above. Whether the latest Wine code should fix the problem, or just lay the ground-work for the fix, I am not clear, but the problem in FL Studio remains.
Then this is most likely a different problem. Why do you think it's related to sending WM_SYSCOMMAND?