Hi Joel, Welcome to the Monastery. Hope you stick around for a while. A few comments.
1) add use strict and use warnings. It is just good practice to help keep your errors to a minimum (especially in Tk.
2) You can post even large bits of code, read the FAQ on posting and use the READMORE and CODE tags.
3) I would make the sub "scientific" create a new FRAME:
$scientific_frame =$main->Frame(-background=>'tan',
-foreground=>'black',
-relief=>'groove',
-borderwidth=>3
)->pack(-side=>'bottom',-fill=>'both');

[download]

Then, modify (using "configure") The original menu option to call a different sub which does $scientific_frame->destroy(); then reconfigure the menu to call the original subroutine again if they want to turn scientific back on.
Have fun in the monastery!
-Kevin

In reply to Re: Perl/Tk question by K_M_McMahon
in thread Perl/Tk question by joelnackman

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