atcroft, I added a note right before the code telling everyone to read the comments; thank you for pointing this out.
I had a couple goals in mind when I wrote this:
- Get a Tk Tutorial out there as soon as possible for my fellow monks to look at that would be useful, and
- Add to/update the body over time as I received feedback, such as yours.
In any case, thank you again for your feedback. I will make changes over the next few weeks/months to improve the readability and the flow of this Tk Tutorial.