Very strange... I worry about doing that, however, because the man page for Tk::derived says:

Tk::Derived should precede any Tk widgets in the class's @ISA.

Update: And the reason for this appears to be so that you can pass your own arguments. If I switch the order so List appears first and Derived second, then when I create my new object with some option that I want to handle, like my $x = $mw->Foon(-taco => 'bell', -foreground => 'brown');, all the options go to the Label first, which doesn't understand -taco.

Daniel Ashbrook