It depends a lot on the kind of coding guidelines you already have.
I guess most of them are still valid when you code Perl/Tk,
because it still *is* Perl.
However, to improve readability of your Tk script I think it's
good practice to keep your callbacks as compact as you possibly
can, so either use a reference to a seperate subroutine, or
use no more than 2 or three lines for it.
Maybe if you gave a few of the guidelines you already have,
we would be able to extend them for Tk.
Jouke Visser, Perl 'Adept'
Using Perl to help the disabled: pVoice and pStory