How to use AlwaysVisibleControlExtender in asp.net ajax

AlwaysVisibleControlExtender in asp.net ajax
UsingAlwaysVisibleControlExtender.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Drawing" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<!DOCTYPE html>
<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            string[] colorList = Enum.GetNames(typeof(KnownColor));
            foreach (string color in colorList)
            {
                Label1.Text += color + "<br />";
            }
        }
    }    
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Ajax AlwaysVisibleControlExtender - How to use AlwaysVisibleControlExtender in asp.net ajax</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DarkBlue; font-style:italic;">Ajax Control Toolkit Example: Using AlwaysVisibleControlExtender</h2>
        <hr width="600" align="left" color="CornFlowerBlue" />
        <asp:Label 
            ID="Label1" 
            runat="server"
            ForeColor="DodgerBlue"
            Font-Italic="true"
            Font-Names="Comic Sans MS"
            Font-Size="Large"
            >
        </asp:Label>
        <asp:ScriptManager 
            ID="ScriptManager1"
            runat="server"
            >
        </asp:ScriptManager>
        <cc1:AlwaysVisibleControlExtender 
            ID="AlwaysVisibleControlExtender1"
            runat="server"
            TargetControlID="Panel1"
            VerticalSide="Top"
            HorizontalSide="Right"
            >
        </cc1:AlwaysVisibleControlExtender>
        <asp:Panel 
            ID="Panel1" 
            runat="server"
            Width="250"
            Height="100"
            BorderWidth="2"
            BorderColor="LightPink"
            BackColor="OrangeRed"
            HorizontalAlign="Center"
            >
            <br />
            <asp:TextBox 
                ID="TextBox1"
                runat="server"
                BackColor="LightGoldenrodYellow"
                ForeColor="HotPink"
                Font-Bold="false"
                Text="Your Email"
                Width="200"
                Height="25"
                >
            </asp:TextBox>
            <asp:Button 
                ID="Button1"
                runat="server"
                Text="Subscribe RSS Feed"
                Font-Bold="true"
                ForeColor="SaddleBrown"
                Height="40"
                />
        </asp:Panel>
    </div>
    </form>
</body>
</html>
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