It looks like you can also place buttons on a canvas and then scale the canvas. I don't have time to dig into this and there are monks around who are experienced with Perl/Tk who might be able to provide an example.

Edit: Here is a Perlmonks node that deals with scaling canvases but not really scaling buttons. It might give you something to go on.

In reply to Re^3: Tk - Tick box size change by Lotus1
in thread Tk - Tick box size change by merrymonk

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