Yii实现多按钮保存与提交（不冲突)

'buttons'=>array(
        'preview'=>array(
            'type'=>'submit',
            'label'=>yii::t('core','Show preview'),
        ),
        'draft'=>array(
            'type'=>'submit',
            'label'=>yii::t('core','Save draft'),
        ),
        'submit'=>array(
            'type'=>'submit',
            'label'=>yii::t('core','Submit'),
        ),
        CHtml::link(yii::t('core','Cancel'),yii::app()->homeUrl),
    ),

if($form->submitted('submit'))
                $model->status=Post::STATUS_PROPOSED;
            else
                $model->status=Post::STATUS_DRAFT;

>
if(isset($_POST['submityes']))