Toplevel Minimizing not working.

AS Perl V5.12
Tcl V8.5.9
Windows XP SP3

I have recently discovered that I doing something in my code or using code from a module that disables the ability to minimize toplevel widgets/windows (thanks to the suggestions out in PERL MONKS). But unfortunately I am unsure what to be looking for? What callback would I look for? Is there a binding I should be looking at? Can I modify the platform specific system menu? How do I reset the Minimize button? Are any of these possible? The maximize and Close buttons work fine.

thanks,
gary