$params['view_mode']['api.default'] = 'view';
$params['view_mode']['title'] = ts('View Mode for Navigation URL');
$params['view_mode']['type'] = CRM_Utils_Type::T_STRING;
$params['view_mode']['api.default'] = 'view';
$params['view_mode']['title'] = ts('View Mode for Navigation URL');
$params['view_mode']['type'] = CRM_Utils_Type::T_STRING;