Adding GUI functionality to TCL script

If you get something working, would you mind posting the framework? I've occasionally thought of ideas where a GUI would be helpful as a pre-flow script, so it might be useful. (I've done two Tk GUI scripts many years ago, and to be honest, had a decent amount of trouble writing in the Tk syntax and getting it to work. I've heard there are other tools that are better and write out a Tk script. Of course, if you just have a single button it may not be a big deal.)