kartik grid的分页功能怎么填呢 ？默认20不够用啊！ [ 2.0 版本 ]

echo GridView::widget([
    'dataProvider'=> $dataProvider,
    'columns' => $gridColumns,
    'export'=> false,
    'toolbar' => [
        [
            'content'=>
            Html::button('<i class="glyphicon glyphicon-plus"></i>', [
                'type'=>'button',
                'title'=>'Add',
                'class'=>'btn btn-success'
            ]) . ' '.
            Html::a('<i class="glyphicon glyphicon-repeat"></i>', ['index'], [
                'class' => 'btn btn-default',
                'title' => 'Reset Grid'
            ]),
            'options' => ['class' => 'btn-group-sm']
        ],
        '{export}',
        '{toggleData}'
    ],
   'toggleDataContainer' => ['class' => 'btn-group-sm'],        
   'panel' => [
      'heading'=>'<h3 class="panel-title"><i class="glyphicon glyphicon-globe"></i> Servers</h3>',
      'type'=>'success',
      'footer'=>true
    ],
    'showPageSummary'=>true,
]);