code: protected function initParams()
      {
          Yii::$app->view->params['h1'] = Yii::t('wavecms/main', '<i>Not set</i>');
          Yii::$app->view->params['buttons_top'] = [];
          Yii::$app->view->params['buttons_btm'] = [];
          Yii::$app->view->params['buttons_sublist'] = [];
      }
docs: Init required params