my $slist = Gtk3::SimpleList->new (
              'Text Field'    => 'text',
              'Markup Field'  => 'markup',
              'Int Field'     => 'int',
              'Double Field'  => 'double',
              'Bool Field'    => 'bool',
              'Scalar Field'  => 'scalar',
              'Pixbuf Field'  => 'pixbuf',
            );