use Tk;
my $window = MainWindow->new();

##</code><code>##

my $frame = $mainmenu->Toplevel(-title => 'Amend User',); 

##</code><code>##

my $frame = $window->Toplevel(-title => 'Amend User',); 

##</code><code>##

MainLoop();

##</code><code>##

Tk::Error: Undefined subroutine 
&main::process_amend_userorderroute called at C:
\Documents and Settings\blm\Desktop\test2.pl line 37.
 Tk callback for .toplevel.button
 Tk::__ANON__ at C:/Perl/site/lib/Tk.pm line 247
 Tk::Button::butUp at C:/Perl/site/lib/Tk/Button.pm line 111
 <ButtonRelease-1>
 (command bound to event)