http://bugs.winehq.org/show_bug.cgi?id=26508
--- Comment #1 from Dmitry Timoshkov dmitry@codeweavers.com 2011-03-22 02:15:22 CDT --- http://www.winehq.org/pipermail/wine-patches/2011-March/100190.html should fix the bug by avoiding anything but _NET_WM_WINDOW_TYPE_NORMAL type for windows.