in reply to Building GUIs with a GUI
Yes, you can use any GUI builder from Tcl/Tk and then use either Tkx or Tcl::Tk for further programming.
I use this approach now in all my Tk applications (although I do not actually use vtcl anymore, but I do mix pure-Tcl code with perl/Tk code).
So, welcome to the club!
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(this ML serves 3 CPAN modules: Tkx, Tcl::Tk and Tcl)