Ajax 1.0 XMLHTTP callbacks via Updatepanel in Custom Web Controls. POWERFUL and cake!!!

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace DummyControls
{
    /// <summary>
    /// Summary description for PartialRefreshDummy
    /// </summary>
public class PartialRefreshDummy : WebControl, IPostBackEventHandler 
{
// Defines the Click event.
public event EventHandler Click1;
public event EventHandler Click2;
public event EventHandler Click3;

public ScriptManager sm;
public PartialRefreshDummy() : base("div")
{
    //
    // TODO: Add constructor logic here
    //
}
//Invoke delegates registered with the Click event.
protected virtual void OnClick1(EventArgs e)
{
    sm.RegisterDataItem(this, "<h1>Sending data from click1</h1>");
    if (Click1 != null)
    {
        Click1(this, e);
    }
}

protected virtual void OnClick2(EventArgs e)
{
    sm.RegisterDataItem(this, "<h2>Sending data from click2</h2>");
    if (Click2 != null)
    {
        Click2(this, e);
    }
}

protected virtual void OnClick3(EventArgs e)
{
    sm.RegisterDataItem(this, "<h3>Sending data from click3</h3>");
    if (Click3 != null)
    {
        Click3(this, e);
    }
}


// Define the method of IPostBackEventHandler that raises change events.
public void RaisePostBackEvent(string eventArgument)
{
    switch (eventArgument)
    {
        case "click1":
            OnClick1(new EventArgs());
            break;
        case "click2":
            OnClick2(new EventArgs());
            break;
        case "click3":
            OnClick3(new EventArgs());
            break;
    }
}
protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
    sm = ScriptManager.GetCurrent(Page);
}
protected override void CreateChildControls()
{
    base.CreateChildControls();
    ClientScriptManager cs = Page.ClientScript;

    string click1 = cs.GetPostBackEventReference(this, "click1");
    string click2 = cs.GetPostBackEventReference(this, "click2");
    string click3 = cs.GetPostBackEventReference(this, "click3");
    
    string postback1 = string.Format(
"<span id=\"span1_{0}\" onclick=\"{1}\" style=\"border:1px solid #000;" +
"margin:2px;background:yellow;cursor:pointer\">click1</span>", 
this.ClientID, click1);
    
    string postback2 = string.Format(
"<span id=\"span2_{0}\" onclick=\"{1}\" style=\"border:1px solid #000;" + 
"margin:2px;background:yellow;cursor:pointer\">click2</span>", 
this.ClientID, click2);
    
    string postback3 = string.Format(
"<span id=\"span3_{0}\" onclick=\"{1}\" style=\"border:1px solid #000;" + 
"margin:2px;background:yellow;cursor:pointer\">click3</span>", 
this.ClientID, click3);
    
    Control parent;
    Control container;
    if (sm == null || !sm.EnablePartialRendering)
    {
        // If user did not add a scriptmanager control or has disabled
        // partial rendering, use a
        // dummy control as the container and gracefully degrade to 
        // full postbacks
        parent = container = new Control();
    }
    else
    {
        // Create an UpdatePanel control.
        UpdatePanel up = new UpdatePanel();
        // Instead of adding child controls directly to 
        // the UpdatePanel control, add them to its 
        // ContentTemplateContainer.
        container = up.ContentTemplateContainer;
        // Create triggers for our 3 events -->> click1, click2, click3
        AsyncPostBackTrigger apbt1 = new AsyncPostBackTrigger();
        apbt1.ControlID = this.ClientID;
        apbt1.EventName = "click1";

        AsyncPostBackTrigger apbt2 = new AsyncPostBackTrigger();
        apbt2.ControlID = this.ClientID;
        apbt2.EventName = "click2";

        AsyncPostBackTrigger apbt3 = new AsyncPostBackTrigger();
        apbt3.ControlID = this.ClientID;
        apbt3.EventName = "click3";

        up.Triggers.Add(apbt1);
        up.Triggers.Add(apbt2);
        up.Triggers.Add(apbt3);
        parent = up;
    }
    Controls.Add(new LiteralControl("Static time: " + 
        DateTime.Now.ToString() + "<br /><br />"));
    container.Controls.Add(new LiteralControl("Dynamic time: " + 
        DateTime.Now.ToString() + "<br /><br />"));
    container.Controls.Add(new LiteralControl(postback1));
    container.Controls.Add(new LiteralControl(postback2));
    container.Controls.Add(new LiteralControl(postback3));
    Controls.Add(parent);
    
}

}
}

<%@ Page Language="C#" %>
<%@ Register TagPrefix="ctl" Namespace="DummyControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
 <asp:ScriptManager ID="ScriptManager1" 
 EnablePartialRendering="true" runat="server">
    </asp:ScriptManager>
<ctl:PartialRefreshDummy ID="prd1" runat="server" />
</div>
<div id="output"></div>
</form>
<script type="text/javascript" language="javascript">
var pageManager = Sys.WebForms.PageRequestManager.getInstance();
pageManager.add_beginRequest(BeginRequestHandler);
pageManager.add_endRequest(EndRequestHandler);
function BeginRequestHandler(sender, args)
{
    var div1 = $get('output');
     var elem = args.get_postBackElement();
     div1.innerHTML = ' BeginRequestHandler processing... for controlID: '+ 
     elem.id + '<br />';
}
function EndRequestHandler(sender, args)
{
    var div1 = $get('output');
    var ctlID = sender._asyncPostBackControlClientIDs;
    div1.innerHTML += 'EndRequestHandler endprocessing...for controlID: '+ 
    ctlID + '<br />';
    div1.innerHTML += 'Control who made this callback: ' + 
    ctlID; 
    var dataItems = args.get_dataItems();
    if ($get('prd1') !== null)
        div1.innerHTML += dataItems["prd1"]; 
}
</script>
</body>
</html