Need a "select all" feature in TCL

I hope this is simple... (I tried looking for help in the Shell Programming and Scripting thread, but got no responses.)

I have a TCL script which has several checkboxes. Is there a way to have one of the checkboxes serve as a "select all" and select/deselect all of the other boxes?

Can you show me a mini-sample?

Thanks... Scott E.

[RIGHT][/RIGHT]

Double post, continued here, Thread closed.