Added the ability to bind to a class
Example:
<div class="issue-buttons">
<?
echo CHtml::ajaxButton('Start', $this->createUrl('status', array('id'=>$issue->id, 'status' => Tasks::STATUS_START)), array(
                'type'=>'POST',
                'data'=>array('update'=>true),
                'update' => '.issue-buttons',
            ), array('id' => 'work_status', 'class' => 'btn btn-sm btn-success btn-rounded action-buttons', 'bindClass' => "action-buttons"));
?>
</div>
	modified:   framework/web/helpers/CHtml.php