I created a notebook where Python beginners can freely write with a mouse

IntroductionHello everyone!Recently, I have been working on application development using Python. Until now, I have mostly ...
Ars Technica

Tkinter button stays pressed, why?

Code below has 1 major and 1 minor problem. Major issue is, once you push the button it visually stays pushed. Minor problem is, I run this in Cygwin. I've got an rxvt window behind the Tk window.