Issue with RadToolTipManager's OnAjaxUpdate

Thank you for responding Marin.  However my issue still persists. Here's a simple code I created:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test1.aspx.cs" Inherits="test" MasterPageFile="~/MasterPage.master" %>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentHead" runat="server">
    </asp:Content>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentMain" runat="server">
    <asp:Button id ="btn" runat="server" Text="Click" />

      <telerik:RadToolTipManager runat="server" ID="RadToolTipManager1" ShowEvent="OnClick" RenderMode="Lightweight"
                RelativeTo="Element" Position="BottomLeft" Width="600px" Height="300px"
                Animation="None" HideEvent="ManualClose" Skin="Default" OnAjaxUpdate="OnAjaxUpdate"
                RenderInPageRoot="true" ManualClose="true" Modal="false">       
          <TargetControls>
              <telerik:ToolTipTargetControl TargetControlID="btn" />
          </TargetControls>
             </telerik:RadToolTipManager>     

    </asp:Content>

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Telerik.Web.UI;

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void OnAjaxUpdate(object sender, ToolTipUpdateEventArgs args)
    {
        this.UpdateToolTip(args.Value, args.UpdatePanel);
    }

    private void UpdateToolTip(string elementID, UpdatePanel panel)
    {
        Control ctrl = Page.LoadControl("~/UserControls/PriceBreak.ascx");
        panel.ContentTemplateContainer.Controls.Add(ctrl);

    }
}

When I click on the button, nothing gets fired.

Thanks,

Alex