This webcontrol does not work in Umbarco. Could you please help with a fix? Thank you:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="LoginControl.ascx.cs" Inherits="UmbracoUserControlsForLibrary.LoginControl" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<style>

.ModalPopupBG

{

    background-color: #666699;

    filter: alpha(opacity=50);

    opacity: 0.7;

}

.HellowWorldPopup

{

    min-width:200px;

    min-height:150px;

    background:white;

}

</style>

<asp:scriptmanager id="ScriptManager1" runat="server">

</asp:scriptmanager>

<asp:button id="Button1" runat="server" text="Button" />

<a href="#" onclick="document.getElementById('Button1').click();">DESTINASJONER</a>

<cc1:modalpopupextender id="ModalPopupExtender1" runat="server" 

cancelcontrolid="btnCancel" okcontrolid="btnOkay" 

targetcontrolid="Button1" popupcontrolid="Panel1" 

popupdraghandlecontrolid="PopupHeader" drag="true" 

backgroundcssclass="ModalPopupBG">

</cc1:modalpopupextender>

<asp:panel id="Panel1" style="display: none" runat="server">

<div class="HellowWorldPopup">

                <div class="PopupHeader" id="PopupHeader">Header</div>

                <div class="PopupBody">

                    <p>This is a simple modal dialog</p>

                </div>

                <div class="Controls">

                    <input id="btnOkay" type="button" value="Done" />

                    <input id="btnCancel" type="button" value="Cancel" />

</div>

        </div>

</asp:panel>