You were pretty close. See the widget demo included in the Tk distribution for usage examples. 
  my $menu = $mw->Menu( -tearoff => 0,
                        -menuitems => [
                            [ command  => "Something",
                              -command => [ sub { print 'Hello' }, $ob
+j ] ],
                            [ checkbutton => "Prompt for automatic bac
+kup",
                              -variable   => \$CkAutomaticBackUp,
                              -onvalue    => '1',
                              -offvalue   => '0',
                              -compound   => 'left',
                              -command    => [ sub { print "$CkAutomat
+icBackUp" }, $obj ]
                            ],
                        ]);

[download]
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re: Add Tk checkbox to popup menu by choroba
in thread Add Tk checkbox to popup menu by Anonymous Monk

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