TabContainer control not displaying on page [as a popup]

Hi,

I'm using  TabContainer control in my page (asp.net 4.0) and i want to open (MyPopup.aspx) popup page from button click of another page (MainForm.aspx)

See the following code of both the pages.

Problem:

Tabcontainer is not displaying while clicking on button. Only blank page is displaying.

NOTE: If I run directly popup then it is displaying tab control, but when i'm trying to openMyPopup.aspx as a popup, then it is not displaying TabContainer control.

Code:-

---------MyPopup.aspx

.........<ajax:ToolkitScriptManager ID="scriptmanager1" runat="server" ScriptMode="Release"></ajax:ToolkitScriptManager><div style="width: 40%"><ajax:TabContainer ID="TabContainer1" runat="server" Visible="true" CssClass="fancy fancy-green"><ajax:TabPanel ID="tbpnluser" runat="server"><HeaderTemplate>
                        New User</HeaderTemplate><ContentTemplate><asp:Panel ID="UserReg" runat="server"><table align="center"><tr><td></td><td align="right"></td><td align="center"><b>Registration Form</b></td></tr></table></asp:Panel></ContentTemplate></ajax:TabPanel></ajax:TabContainer></div>

------ MainForm.aspx

$('#btnsearch').click(function () {

              ..........      
                      var URL = String.format("MyPopup.aspx?SearchCriteria={0}&NavigatedFromModule={1}", $('#txtSerachCriteria').val(), encodeURI(module))                    
                        var divSearchResult = $('#divSearchResult');
                        divSearchResult.dialog({ autoOpen: false });
                        divSearchResult.dialog({ 'width': '900', 'height': 'auto' });

                        divSearchResult.load(URL);

                        var divSearchResult = $('#divSearchResult');
                        divSearchResult.dialog('open');$('.ui-dialog-content').css({ 'width': '95%', 'margin': '0 auto', 'height': 'auto', 'max-height': '400px', 'overflow-y': 'auto', 'padding-bottom': '10px' });$('.ui-dialog-titlebar-close span.ui-button-text').text('X').css({ 'cursor': 'pointer' });$('.ui-dialog-titlebar-close').css({ 'cursor': 'pointer', 'height': '33px', 'overflow': 'hidden' });$('.ui-dialog-title').text('SEARCH QUEUE').addClass('popupHeading').attr('style', 'float:left');$('.ui-dialog-titlebar').after().append('<div class="clear"></div>')$('.ui-dialog').css({ 'position': 'absolute', 'min-width': '900px' });$('.ui-dialog').position({
                            my: "center",
                            at: "center",
                            of: window

Thanks in advance.