yii2tech\admin\grid\ActionColumn::initDefaultButtons PHP Method

    protected function initDefaultButtons()
    {
        $this->buttons = ArrayHelper::merge(['view' => ['icon' => 'eye-open', 'options' => ['title' => Yii::t('yii', 'View'), 'aria-label' => Yii::t('yii', 'View'), 'data-pjax' => '0']], 'update' => ['icon' => 'pencil', 'options' => ['title' => Yii::t('yii', 'Update'), 'aria-label' => Yii::t('yii', 'Update'), 'data-pjax' => '0']], 'delete' => ['icon' => 'trash', 'visible' => function ($model) {
            /* @var $model \yii\db\BaseActiveRecord */
            if (is_object($model) && $model->canGetProperty('isDeleted')) {
                return !$model->isDeleted;
            }
            return true;
        }, 'options' => ['title' => Yii::t('yii', 'Delete'), 'aria-label' => Yii::t('yii', 'Delete'), 'data-confirm' => Yii::t('yii', 'Are you sure you want to delete this item?'), 'data-method' => 'post', 'data-pjax' => '0']], 'restore' => ['icon' => 'repeat', 'visible' => function ($model) {
            /* @var $model \yii\db\BaseActiveRecord */
            if (is_object($model) && $model->canGetProperty('isDeleted')) {
                return $model->isDeleted;
            }
            return false;
        }, 'options' => ['title' => Yii::t('yii2tech-admin', 'Restore'), 'aria-label' => Yii::t('yii2tech-admin', 'Restore'), 'data-confirm' => Yii::t('yii2tech-admin', 'Are you sure you want to restore this item?'), 'data-method' => 'post', 'data-pjax' => '0']]], $this->buttons);
    }

 /** @inheritdoc */
 protected function initDefaultButtons()
 {
     parent::initDefaultButtons();
     $this->buttons['edit'] = $this->buttons['update'];
     unset($this->buttons['update']);
     $this->buttons['view']['options'] = ['target' => '_blank'];
     array_walk($this->buttons, function (&$item) {
         $item['options'] = ArrayHelper::merge($item['options'], ['class' => 'btn btn-default btn-sm']);
     });
 }