protected function addValidFromBlock(\Gems_Model_Bridge_ThreeColumnTableBridge $bridge, \MUtil_Model_ModelAbstract $model, \Gems_Menu_MenuList $links)
    {
        // Editable part (INFO / VALID FROM / UNTIL / E-MAIL
        $button = $links->getActionLink($this->request->getControllerName(), 'edit', true);
        $bridge->addWithThird(
                'gto_valid_from_manual',
                'gto_valid_from',
                'gto_valid_until_manual',
                'gto_valid_until',
                'gto_comment',
                $button
                );

        return true;
    }