$this->widget('zii.widgets.grid.CGridView', array(
    'id'=>'my-id',
    'dataProvider'=>$model->search(),
        'filter'=>$model,
        'selectableRows'=>2,
    'columns'=>array(
                array(
                    'class'=>'CCheckBoxColumn',
                    'checkBoxHtmlOptions' => array(
                        'name' => 'bankid[]',
                    )
                ),
        'bank_statement',

         ),
));