my $menu = $mw->Menu( -tearoff => 0,
                        -menuitems => [
                            [ command  => "Something",
                              -command => [ sub { print 'Hello' }, $obj ] ],
                            [ checkbutton => "Prompt for automatic backup",
                              -variable   => \$CkAutomaticBackUp,
                              -onvalue    => '1',
                              -offvalue   => '0',
                              -compound   => 'left',
                              -command    => [ sub { print "$CkAutomaticBackUp" }, $obj ]
                            ],
                        ]);