http://bugs.winehq.org/show_bug.cgi?id=6297
--- Comment #21 from Luke Bratch l_bratch@yahoo.co.uk 2007-10-18 16:38:25 --- What works for me, is to launch a game from the menu, and leave the mouse over the main Steam window until the game has loaded, that pretty much never fails, whereas taking the mouse of does.
It is also possible to close the window just in time if you get used to how long it takes the game to start and close it right before.