I think this is what you want (specifically line 6). 
my %tk;
$tk{top}       =  MainWindow->new();
$tk{menubar}   =  $tk{top}->Menu;
$tk{top}->configure( -menu => $tk{menubar} );
$tk{menu_file} =  $tk{menubar}->cascade( -label => '~File' );
$tk{menu_exit} =  $tk{menubar}->command( -label => '~Exit', -command =
+> sub { Tk::exit(0); } );

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Updated: Changed "my $tk;" to "my %tk;"

In reply to Re: TK menu question by Argel
in thread TK menu question by hebes_99

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