Clistview Yii框架Ajax

I have a problem in using Ajax and ClistView.

I have 2 posts , each one has comments, the first one has 3 comments, the second one , one comment.

Post A

Link to Comments(3)

Post B

Link to Comments(1)

When I click on Link to Comments(3), I got the following, as expected

Post A

Comment 1

Comment 2

Comment 3

Post B

Link to Comments(1)

But when I click on comments(1), I got

Post A

Comment 1 of post B

Post B

So the comment of Post B displays under the post A.

How can I solve the problem ?

The code of the Ajax link is the following

<?php           

            echo CHtml::ajaxLink(
            'Test request', 
            array($url_replace),
            array(
            'update'=>'#req_res_loading',
            'beforeSend' => 'function() {           
            $("#maindiv").addClass("loading");
            }',
            'complete' => 'function() {
                $("#maindiv").removeClass("loading");
            }',        
            )
            );
        echo '<div id="req_res_loading">...</div>';

        ?>

and the comments are called through the Clistview command

<?php $this->widget('zii.widgets.CListView', array(
    'dataProvider'=>$dataProvider,
    'itemView'=>'_comment',
    'template'=>"{items}
{pager}",
)); ?>

my _comments view contains the following

<?php $this->widget('zii.widgets.CListView', array(
    'dataProvider'=>$dataProvider,
    'itemView'=>'_comment',
    'template'=>"{items}
{pager}",
)); ?>

and my _comment view contains the following

<div class="comment">


    <div class="content">
        <?php
            $this->beginWidget('CMarkdown', array('purifyOutput'=>true));
            echo $data->content;
            $this->endWidget();
        ?>
    </div>

</div>

and the post view is renderPartial with this code

<div class="post">
    <div class="title">
        <?php echo CHtml::link(CHtml::encode($data->title), $data->url); ?>
    </div>
    <div class="author">
        posted by <?php echo $data->author->username . ' on ' . date('F j, Y',$data->create_time); ?>
    </div>
    <div class="content">
        <?php
            $this->beginWidget('CMarkdown', array('purifyOutput'=>true));
            echo $data->content;
            $this->endWidget();
        ?>

    </div>

Thank you in advance for your help