When a tk program is run through wish on windows 7, using tk 8.6.4, and a window is created, it doesn't seem to be focused by default. I have tested with the following program:

 #! tclsh
 package require Tk
 button .b -text {Push Me} -command {tk_messageBox -message {hello, world}}
 pack .b

When using jaws for windows (a screen reader I use as I am blind), it reports that there is no active window when I run that program through wish. Alt tabbing a few times will bring the window in focus.
Preferably the window should be focused automatically when created, to minimize problems and confusion for users of screen readers.
Thanks,
-Michael.