Mine

    'widescreen':
        (Choice, 'Widescreen', 'off|nopanscan|noletterbox'),

       for option in options:
            self.widgets[option] = getWidget(self, option)
            self.widgets[option].grid(sticky=W)
        self.widgets['widescreen'].set('off')
    def setOptions(self, command):
        """Add relevant todisc options to the given Command."""
        for option, widget in self.widgets.items():
            value = widget.get()
            if value and value != "off":
                command.add('-%s' % option, value)