dynamic loading doesn't work correctly

Hi
I use DHTMLX Grid professional. I’m going to show 100,000 rec’s in a grid with XML. I used smart rendering mode but it just show me the first page .

    mygrid = new dhtmlXGridObject('gridbox');
    mygrid.setImagePath('theme/default/imgs/dhxgrid_skyblue/');
    mygrid.setHeader('......');
    mygrid.setInitWidths('40,160,160,160,200,50');
    mygrid.setColAlign('center,right,center,center,center');
    mygrid.setColTypes('ro,ed,ed,ed,ed,ch');
    mygrid.enableSmartRendering(true,50);
    mygrid.init();
    var gridQString  = './index.php?isxml=1&folder=./Modules/emails/contact&pageName=get';
    mygrid.loadXML(gridQString);
<?php $index = (isset($_GET["posStart"])) ? mysql_real_escape_string($_GET['posStart']) : 0 ; $limit = (isset($_GET["count"])) ? mysql_real_escape_string($_GET['count']) : $count = 100; if($index == 0) { $query = "SELECT COUNT(ml_id) AS total FROM pd_emails"; $result = $db->Select($query); $total = $result[0]['total']; } $result = ContactSearch($mlName,$mlMail,$comb,$mlTel,$mlextra,0,$index,$limit); $str = ""; for($i=0;$i<count($result);$i++) { $row = ($index)+$i+1; $id = $result[$i]['ml_id']; $name = $result[$i]['ml_name']; $mobile = $result[$i]['ml_mobile']; $mail = $result[$i]['ml_mail']; $extra = $result[$i]['ml_extra']; $active = $result[$i]['ml_active']; $str .= " $row $name $mobile $mail $extra $active "; } echo $header; echo $str.''; ?>

Unfortunately the issue cannot be reproduced locally.
If the problem still occurs for you please, provide with a complete demo or a demo link, where the problem can be reconstructed.