http://bugs.winehq.org/show_bug.cgi?id=12525
--- Comment #4 from Reece Dunn msclrhd@gmail.com 2008-04-12 06:41:21 --- On Ubuntu 7.10 (Gnome), using Ctrl+Tab to switch between a Wine application (e.g. notepad) does not switch the focus. However, pressing the mouse button on the content of the parent window (e.g. the menu bar in notepad) correctly sets the focus.
Therefore, this looks like it may be a bug processing the WM_ACTIVATEAPP message.
I can reproduce this 100% of the time on different applications.