Sample

'buttons'=>array
(
'addasset' => array
(
    'label'=>'Add Asset',
    'url'=>'Yii::app()->createUrl("po/addasset", array("id"=>$data->id))',
    'options'=>array(
        'class'=>'btn btn-success',
    ),
),
'edit' => array
(
    'label'=>'Edit',
    'url'=>'Yii::app()->createUrl("po/update", array("id"=>$data->id))',
    'options'=>array(
        'class'=>'btn btn-warning',
    ),
),
'hapus' => array
(
    'label'=>'Delete',
    'url'=>'Yii::app()->createUrl("po/delete", array("id"=>$data->id))',
    'options' => array(
        'class'=>'btn btn-danger',
        'ajax' => array(
            'type'=>'post',
            'url'=>'js:$(this).attr("href")',
            'success' => 'js:function(data) {
                $.fn.yiiGridView.update("po-grid");
            }'
        )
    ),
),