yii2 GridView ActionColumn customization

echo GridView::widget(
    [
        'dataProvider' => $pList,
            'showOnEmpty'=>true,

           'columns' => [

             [
               'label' =>"Поле1",
               'attribute' => 'field1',
               'format' =>  'text'  //=>"raw", "text", "html", ['date', 'php:Y-m-d']).

                'contentOptions' => ['class' => 'text-center'],
                 'headerOptions' => ['class' => 'text-center']

            ],

            [
               'label' =>"Поле2",
               'attribute' => 'field2',
               'format' =>  'raw',
               'value'=>function($data){return $data['field2']?'<span class="icon-u">&#10004;</span>':''; }

            ],
            ['class' => 'yii\grid\ActionColumn',
            'buttons' => [
               'update' => function ($url, $model, $key) use($myVariable) {
                   return Html::a('','', ['class'=>'glyphicon glyphicon-pencil','data-cmd'=>'edit','data-id'=>$key]);
                   },
                'delete' => function ($url, $model, $key) use($myVariable) {
                   return Html::a('','', ['class'=>'glyphicon glyphicon-trash','data-cmd'=>'delete','data-id'=>$key]);
                   },
                'view' => function ($url, $model, $key) use($myVariable) {
                   return '';
                   }


            ],

            ],


           ],


    ]
);