How can I hide a ModalPopupExtender embedded in an ASCX user control through javascript (with no postback)?


I have an application.
Within that application I have a ModalPopupExtender embedded within an ASCX user control.
I would like to be able to wire up a cancel button so I can hide the popup when user presses cancel
without doing a post back.

Here is what I have so far:
<cc1:ModalPopupExtender ID="PopupExtender1" runat="server" PopupControlID="pnlPopup" BehaviorID="mdlPopupForm"
    TargetControlID="btnHiddenSubmit" OkControlID="btnOkay" CancelControlID="btnCancel" 
    Drag="true" PopupDragHandleControlID="PopupHeader" EnableViewState="true" 
    BackgroundCssClass="modalBackground" ClientIDMode="Static" />

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Here is the HTML for btnCancel:
<input type="button" id="btnCancel" onclick="cancelPopupPanelClick()" value="Cancel" />

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Here is the javascript:
    function cancelPopupPanelClick() {

        var modalPopup = $find('PopupExtender1');
        if (modalPopup != null) {

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The event fires fine. The issue I'm having is that I can't "Find" the modalPopup in order to hide it.
Is this complicated by the fact that I have the ModalPopupExtender embedded in an ASCX control?

I have verified that the "AjaxControlToolkit.ToolkitScriptManager" is loaded in the containing ASPX page.

Can someone get me pointed in the right direction?

jxbmaSoftware ConsultantAsked:
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use Behaviour ID of your modalpopup...

change this  
var modalPopup = $find('PopupExtender1');

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var modalPopup = $find('mdlPopupForm');

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