Thanks for the suggestion. I installed the module, ran the code in the synopsis (after adding use TK; at the top and MainLoop; at the bottom), and got a blank Tk screen. Unfortunately the documentation is quite sparse. Do you happen to have a working sample of this module? It appears to be exactly what I need. Thanks.
"Its not how hard you work, its how much you get done."
Thanks zentara. The Tk::CheckbuttonGroup module works great! It looks like the synopsis code was missing "pack". Unfortunately, I just found out I'm not going to be able to install additional CPAN modules at deployment sites (sigh), so (taking a cue from the module) I re-worked the frames in my original code to display two vertically aligned columns of checkboxes using only Tk (see new code below). Thanks for all your help.