$dataProvider = new CActiveDataProvider('PersonalMessage', array(
            'criteria' => array(
                'condition' => '(t.sender_id = :user_id OR t.recipient_id = :user_id)',
                'params' => array(
                    ':user_id' => $this->_userId
                ),
                'group' => 't.thread_id DESC',
                'order' => 't.id desc',
                //(t.read=0 && t.recipient_id='.$this->_userId.' && t.sender_id<>'.$this->_userId.')
                //, 'sender'=> array('alias' => 'send')
                'with' => array('recipient'=> array('alias' => 'rec')),
            ),
            'pagination'=>array(
                'pageSize'=>20,
            ),
        ));

        $dataProvider3 = new CActiveDataProvider('PersonalMessage', array(
            'criteria' => array(
                'condition' => '(t.recipient_id = :user_id) && t.read=0',
                'params' => array(
                    ':user_id' => $this->_userId
                ),
                'group' => 't.thread_id DESC',
                'order' => 't.id desc',
                //(t.read=0 && t.recipient_id='.$this->_userId.' && t.sender_id<>'.$this->_userId.')
                //, 'sender'=> array('alias' => 'send')
                'with' => array('recipient'=> array('alias' => 'rec')),
            ),
            'pagination'=>array(
                'pageSize'=>20,
            ),
        ));

        $dataProvider2=new CActiveDataProvider('PersonalMessage',array(
            'criteria'=>array(
                'condition'=>'(t.recipient_id=:support_id)',
                'params'=>array(':support_id'=>User::model()->find('username="support"')->id),
                'order'=>'t.id DESC',
                'group'=>'t.thread_id DESC',
            ),
            'pagination'=>array(
                'pageSize'=>20,
            ),
        ));