> That is because you should be reading the Tk documentation. There is a steep initial learning curve, but you are already part of the way up that curve.

I apologize for saying that, because I am in fact getting very generous help from you (jcb) in 11110311 and bliako in 11110301, and thank you both. I will study the documentation on MainLoop, callbacks, and object destruction to try to get this done right. Thanks again!