http://bugs.winehq.org/show_bug.cgi?id=13951
--- Comment #5 from Dmitry Timoshkov dmitry@codeweavers.com 2011-02-04 03:15:57 CST --- The following test should show the root of the problem:
http://www.winehq.org/pipermail/wine-patches/2011-February/098532.html
Once the failing test is fixed, the reparented window should become movable.