Update in masterpage + autocomplete

Hello i am facing a problem that involves autocomplete, i searched for some help on google, all i tried wasn't working, wanted to try this:

http://weblogs.asp.net/aaronschnieder/archive/2008/03/11/ajaxcontroltoolkit-autocompleteextender-bug-in-an-updatepanel.aspx

But while compiling it gives me about 40 errors, my code is this:

Masterpage

 <ajaxToolkit:ToolkitScriptManager  ID="ScriptManager1" runat="server">
        
</ajaxToolkit:ToolkitScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
                
      <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">

        </asp:ContentPlaceHolder>
        
        
               
    </ContentTemplate>

    </asp:UpdatePanel>

I tried changing textbox autopostback to true, no luck

Thanks for your help.