tkinter: Button color Solaris/Linux

[Bob Greschke]

I have a GUI where the background of the "GO" button, for example, turns 
green while the associated action is running.  On Windows it works fine, but 
on Solaris and Linux the button background turns white (or whatever) when 
the mouse pointer enters the button, the background stays that color while 
Button-1 is being held down, and the background continues to stay that color 
when Button-1 is released.  The background only turns green when the user 
moves the pointer off of the button.  Can that be fixed, or is that an 
X-Windows thing?

Thanks!

Bob