[ajaxpro] Add Ajax programmaticly

[LCID Fire]

I tried to build a test application for calling a server side method
out of javascript but it just doesn't work. It seems to me it doesn't
register the type for callback. I setup the web.config, like the quick
sample, too.
Can anybody provide a simple example how to do this?

I tried the following:

namespace test
{
    public partial class treelist : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            HtmlImage image = new HtmlImage();
            image.Src = "http://www.golem.de/_img/logo_bottom.gif";;
            image.Attributes["OnClick"] = "test.treelist.Expand(4,
Expand_callback)";

            ClientScript.RegisterClientScriptBlock(GetType(),
"expandcallback", "function
Expand_callback(result){alert(result.value}}", true);
            form1.Controls.Add(image);
            Utility.RegisterTypeForAjax(GetType());
        }

        [AjaxMethod]
        public String Expand(int recId)
        {
            return "blub";
        }
    }
}


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