I'm far from an expert in Tk, but I've just finished a couple of programs in it for an advanced perl class, so here goes my two cents. :)
Is there a reason you have
$self->Label(-text=>"var= $optnum")->pack();
instead of
$self->Label(-text=>$optnum)->pack();
If you're actually trying to make your text label $optnum, I believe that you need -text=>$optnum.
Hope that helps!
p.s.
If you find something to debug Tk, let me know would you? I had a HELL of a time debugging my Tk stuff beyond the print a line type of debugging.
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