https://bugs.winehq.org/show_bug.cgi?id=39637
--- Comment #2 from Anastasius Focht focht@gmx.net --- Hello Dmitry,
--- quote --- Could this be related to an activation context window class redirection? --- quote ---
I considered it initially hence I included +actctx but later not so sure. It's either the window class "locality" or the instance handle where it goes wrong. It would help if someone could install/run the app on Windows and use Spy++/Winspector tool to dump the 'MfcButton' window class properties.
Regards