how to solve this problem in popupcontolextender

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ASP.NET

Javascript

Ajax

hello,

here i give my javascript.
when i use: modelpopupextender

<ajaxtoolkit:ModalPopupExtender ID="mpid" BehaviorID="myBID"  runat="server"
TargetControlID="img" PopupControlID="Pan1" CacheDynamicResults="true"
DropShadow="true" CancelControlID="img">

 
<script type="text/javascript" language="javascript">
 
function showModal(index) {
 

document.getElementById('<%=lab.ClientID%>').innerHTML = index;
var modal = $find("myBID");
modal.set_X(gx + 5); // Note: here, it invokes or goes to set_X function.  here i am getting gx value (for ex: 75).
modal.set_Y(gy);
modal.show();
 
}
 
}

when i use : popupcontrolextender:

asi used modelpopupextender , it is not allowing other asp.net control to be enable. once poped up , all other asp.net control got disabled. so i used popupcontrolextender to resolve below.

<ajaxtoolkit:PopupControlExtender ID="PopEx"  runat="server"
TargetControlID="img" BehaviorID="myBID"
PopupControlID="Pan1"
Position="Bottom" />

when i debug tha javascript function.
everthing works similar when i used modelpopupextender.

but here,

modal.set_X(gx + 5); Note: here, here also i am getting gx value (for ex: 75) , but,it does not invoke or does not go to set_X function. becuase of this my popup is not working. once if it goes set_X function, it will work.

why it is not inovoking. how to solve. help needed.