adding check box in to cgridview

Hi All,

I would like to add a check box inside one of field of the CGridview. I tried code below,code is just returning the string which needs to return checkbox in stopPublish field. Any idea ? Thanks

$this->widget('zii.widgets.grid.CGridView', array(
	'id'=>'content-grid',
	'dataProvider'=>$model->search(),
	'filter'=>$model,
	'cssFile' => Yii::app()->baseUrl . '/css/admin/gridview/style.css',
	'columns'=>array(
		'shortTitle',
		'url',
		'longTitle:html',
		'stopPublish:html'=>array('name'=>'stopPublish', 'value'=>'CHtml::checkBox("stopPublish",$data->stopPublish,array("id"=>"chkPublish_".$data->id))'),
		'adsStartDate'=>array('name'=>'adsStartDate','value'=>'date("Y-m-d",strtotime($data->adsStartDate))'),
		'adsFinishDate'=>array('name'=>'adsFinishDate','value'=>'date("Y-m-d",strtotime($data->adsFinishDate))'),
		array(
			'header' => '',
			'class' => 'CButtonColumn',
			'viewButtonImageUrl' => Yii::app()->baseUrl . '/css/admin/gridview/view.png',
			'updateButtonImageUrl' => Yii::app()->baseUrl . '/css/admin/gridview/update.png',
			'deleteButtonImageUrl' => Yii::app()->baseUrl . '/css/admin/gridview/delete.png',
			'viewButtonOptions'=>array('target'=>'_blank'), 
		),
	),
));