Filter Gridview Don't Work

hello I’m new in yii I have a problem with the filter gridview if you can help me

my controler


public function actionAdmin()

	{

		$model=new Prestation('search');


		if (intval(Yii::app()->request->getParam('clearFilters'))==1) {

            EButtonColumnWithClearFilters::clearFilters($this,$model);

        }


		$criteriaPresta=new CDbCriteria;

		$criteriaPresta->addInCondition('TypePresta',array('1'));

		$criteriaFrais=new CDbCriteria;

		$criteriaFrais->addInCondition('TypePresta',array('2'));

		$this->render('admin',array(

			'model'=>$model,

			'criteriaPresta'=>$criteriaPresta,

			'criteriaFrais'=>$criteriaFrais,

		));

	}

my view




<?php

	$array = array();




     $array[] = array(

    	'name'=>'CodePresta',

    	'header'=>'Code Prestation',

    	'htmlOptions'=>array('style'=>'text-align:left;width:150px;'),

    );

    $array[] = array(

    	'name'=>'LibellePresta',

    	'header'=>'Libelle Prestation',

    	'htmlOptions'=>array('style'=>'text-align:left;width:350px;'),

    );

     $array[] =   array('name' => 'SuiviBenef', 'value' => '"images/icon_checkbox_".$data["SuiviBenef"].".gif"', 'type' => 'image', 'htmlOptions' => array('style' => 'text-align:center'),'headerHtmlOptions' => array('style' => 'width:80px'));

   

    $array[] = array(

    	'name'=>'duree_presta',

    	'header'=>'Duree',

    	'htmlOptions'=>array('style'=>'text-align:left;width:150px;'),

    );

 $array[] = array(

    	'name'=>'encours',

    	'header'=>'En cours',

    	'htmlOptions'=>array('style'=>'text-align:left;width:150px;'),

    );

 

  $array[] = array(

    	'class' => 'EButtonColumnWithClearFilters',

            'clearHtmlOptions'=>array('id'=>'clear0'),

            'updateButtonImageUrl' => 'images/update.png',

            'viewButtonImageUrl' => 'images/view.png',

            'deleteButtonImageUrl' => 'images/delete.png',

            'updateButtonUrl'=>'Yii::app()->controller->createUrl("/prestation/update&id={$data["PrestationID"]}")',

            'viewButtonUrl' => 'Yii::app()->controller->createUrl("/prestation/view&id={$data["PrestationID"]}")',

             'deleteButtonUrl' => 'Yii::app()->controller->createUrl("/prestation/delete&id={$data["PrestationID"]}")',

            'template' => '{update}{view}{delete}',

            'header' => CHtml::dropDownList('pageSize', $pageSize, Yii::app()->params['pageSizeArray'], array(

                'onchange' => "$.fn.yiiGridView.update('prestation-grid',{ data:{pageSize: $(this).val() }})",

            )),

    );




	$dataProvider=$model->SearchPrest();

	$this->widget('zii.widgets.grid.CGridView', array(

    'id' => 'prestation-grid',

    'dataProvider' => $dataProvider,

    'filter' => $model,

    'columns' =>$array ,

           'filterSelector'=>'{filter}, #Prestation_Actif',

    'selectionChanged' => 'function(id){if($.fn.yiiGridView.getSelection(id)>0) document.location.href = "index.php?r=prestation/update&id="+$.fn.yiiGridView.getSelection(id);}',

    'ajaxUpdate'=>'prestation-grid,frais-grid',

    'afterAjaxUpdate' => 'function(){ ajusterHeightOfTable("tab1,tab2"); }',

        'template'=>'{summary}<div class="itemsContainer">{items}</div>{pager}',  

));

?>






and my model




public function SearchPrest(){

        

            $sort = new CSort();

            $sort->attributes = array(

            'duree_presta'=>array(

				'asc'=>'DureePresta',

				'desc'=>'DureePresta desc',

				'default'=>'asc',

			),

                'CodePresta'=>array(

				'asc'=>'CodePresta',

				'desc'=>'CodePresta desc',

				'default'=>'asc',

			),

                'LibellePresta'=>array(

				'asc'=>'LibellePresta',

				'desc'=>'LibellePresta desc',

				'default'=>'asc',

			),

                'SuiviBenef'=>array(

				'asc'=>'SuiviBenef',

				'desc'=>'SuiviBenef desc',

				'default'=>'asc',

			),

                'duree_presta'=>array(

				'asc'=>'DureePresta',

				'desc'=>'DureePresta desc',

				'default'=>'asc',

			),

                'encours'=>array(

				'asc'=>'encours',

				'desc'=>'encours desc',

				'default'=>'asc',

			),);

             $sql = "select PrestationID, CodePresta, LibellePresta,DureePresta,  SuiviBenef, CONCAT(DureePresta,' ',TypeDuree) as duree_presta from Prestation where TypePresta=1 ";

             $res = Yii::app()->db->createCommand($sql)->queryAll();

		$count = count($res);

                $dataProvider=new CArrayDataProvider($res, array(

			'keyField'=>'PrestationID',

			'totalItemCount'=>$count,

                   

			'sort'=>$sort,


			'pagination'=>array(

				'pageSize'=>Yii::app()->user->getState('pageSize',Yii::app()->params['defaultPageSize']),

			),

		));

            foreach($dataProvider->rawData as $key=>$data){

                 $allLgCmd = LigneCommande::model()->findAllBySQL("SELECT RefPrestationID FROM LigneCommande WHERE RefPrestationID=".$data["PrestationID"]);

            $data["encours"] = count($allLgCmd);

            $dataProvider->rawData[$key] = $data;

			}

                

                        

            return $dataProvider;

            

        }