Thanks for a very thorough answer. The dereferencing to get at the coderef had got muddled. Your approach of defining the coderef separately is much clearer. I wasn't sure that defining a coderef that calls a coderef was necessary, but set out like that it appears to be.

As a bonus, you spotted a bug that I was still struggling with - $tkobjects{'stringlabel'} should have been a child of sourceoneframe or sourcetwoframe, so when I came to destroy the frame and replace it the label didn't disappear.

Thanks also for taking the time to dig through the code.

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$perlquestion=~s/Can I/How do I/g;

In reply to Re^2: Tk destroy method dies with "Aborted" by g0n
in thread Tk destroy method dies with "Aborted" by g0n

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