Why do you have that preference?

Because closures are the devil :) and number one source of leaks in reusable Tk (modules); avoiding them is trivial but most folks don't do it :) cause all the zentaras always give closure examples :) Re: Perk Tk - how to send a value from a subroutine back to the main program using Button (without MainLoop),Re: Perl tk FindNext in a text widget