I will point out that your code is bad programming, because you are trying to clean out your labels by destroying the parent frame, still leaves the old labels laying around, and this will cause a memory gain everytime you do it. Using $widget->destroy usually is a bad thing in Tk. You may be able to get away with it, if you run packForget on all children of the frame, then destroy all the children. You are better off, NOT destroying the frame, just empty it then refill it.
/me slaps head. Never thought of that - thanks. Back to the drawing board to do it properly :-) and since this is AFAICT at least the second time I've been corrected on that, I've added it here: Re: Stupid mistakes I repeatedly make
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