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my $slist = Gtk3::SimpleList->new (
              'Text Field'    => 'text',
...
              'Scalar Field'  => 'scalar',
              'Pixbuf Field'  => 'pixbuf',
            );

# just displays the value in a scalar as 
# Perl would convert it to a string
...
             $cell->set (text => $sum);
        } 
   );