protected function init_responsive_config() {

    foreach ( $this->script_config['menuClasses'] as $menus ) {
      foreach ( $menus as $nav ) {
        $attribute                             = ltrim( $nav, '.' );
        $theme_location                        = ltrim( $nav, '.nav-' );
        $this->responsive_config[ $attribute ] = $theme_location;
      }
    }

  }