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

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

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

MainLoop();

Tk::Error: Undefined subroutine 
&main::process_amend_userorderroute called at C:
...
 Tk::Button::butUp at C:/Perl/site/lib/Tk/Button.pm line 111
 <ButtonRelease-1>
 (command bound to event)