Hi, I'm trying to create a user control that uses components from the AjaxControlToolkit. The User Control works fine in Firefox but not in Chrome or IE. A simple example is given below:

The User Control is setup as follows:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="UmbCC1v0.ascx.cs" Inherits="UmbCC1v0.UmbCC1v0" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>
<ajaxToolkit:ToolkitScriptManager runat="server"></ajaxToolkit:ToolkitScriptManager>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
    <ajaxToolkit:SliderExtender runat="server" BoundControlID="TextBox1" 
        TargetControlID="TextBox2"></ajaxToolkit:SliderExtender>

The ascx and dll's are copied across to an Umbraco 4.9.0 site. Firefox shows the user control in a page as expected, however IE and Chrome both just show the 2 text boxes. The error shown in IE Developer is:

SCRIPT5022: Sys.ArgumentUndefinedException: Value cannot be undefined.

Parameter name: baseType

I have tried a variety of different approaches to solving this as outlined in the forums but without sucess.

Please can someone point me in the direction of how to do this.

Thanks

Andy.