Yii把CGridView文本框换成下拉框的方法

<?php
$this->widget('zii.widgets.grid.CGridView',array(
??? 'id'=>'business-grid',
??? 'dataProvider'=>$dataProvider,
??? 'filter'=> Business::model(),
??? 'columns'=>array(
??????? 'business_id',
??????? 'name',
??????? 'package_id'=> array(
??????????? 'name' => 'package_id',
??????????? 'value' => '$data->package->package_title',
??????????? 'filter'=> CHtml::listData(Packages::model()->findAll(array('order'=>'package_title')),'package_id','package_title')
??????? ),
??????? 'user_id'=>array(
??????????? 'name' => 'user_id',
??????????? 'value' => '$data->user->name',
??????????? 'filter'=> CHtml::listData(Users::model()->findAll(array('order'=>'firstname')),'id','name')
??????? ),
??????? 'categories' => array(
??????????? 'name' => 'categories',
??????????? 'value' => '$data->returnAllCategories(",",false);',
??????????? 'filter'=> CHtml::listData(Categories::model()->findAll(array('order'=>'category')),'cat_id','category')
??????? ),
??????? 'keywords' => array(
??????????? 'header' => 'Keywords',
??????????? 'value' => '$data->returnAllKeywords(",
??????? ),
??????? 'links'=>array(
??????????? 'header'=>'Manage',
??????????? 'type'=>'raw',
??????????? 'value'=>'CHtml::link(CHtml::image(Yii::app()->request->baseUrl."/images/admin/approve.png","Approve"),array("approve","id"=>$data->business_id,"item"=>"business"),array("class"=>"approve-link","title"=>"Approve Business"))." ".
?????? CHtml::link(CHtml::image(Yii::app()->request->baseUrl."/images/admin/reject.png","Reject"),array("reject",array("class"=>"reject-link","title"=>"Reject Business"))',
??? ),
));

'type'=>array(
??? 'name' => 'type',
??? 'filter'=>$model->getTypeOptions(),
),

PHP实例'type'=>array(
??? 'name' => 'type',