Not able to drag down baloonpopup extender in ASP.NET It shows black circle with line. (not allowing to drag on form) but when i drag it on text box it work but when i run the page textbox diappears. please help and also tell how to use baloonpopup extender.

Do you have some code that we can take a look at?

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AjaxExtention.aspx.cs" Inherits="AjaxExtention" %>

<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:CalendarExtender ID="TextBox1_CalendarExtender" runat="server" 
        TargetControlID="TextBox1">
    </asp:CalendarExtender>
    <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </asp:ToolkitScriptManager>
    <br />
    <i>TextBox:</i><asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>


    <asp:Panel ID="Panel1" runat="server">
     <b>SEARCH</b>
    </asp:Panel>
<div>
    <Ajax:BalloonPopupExtender ID="BalloonPopupExtender1" runat="server" BalloonPopupControlID="Panel1" BalloonSize="Small"BalloonStyle="Cloud" UseShadow="true" DisplayOnClick="true" DisplayOnFocus="false" DisplayOnMouseOver="true" TargetControlID="TextBox2"Position="BottomRight">
    </Ajax:BalloonPopupExtender>
</div>

    <br />
    <br />
    <div>

    </div>
    </form>
</body>
</html>

//Displaying message: - This control cannot be display because its tagprefix is not register in this web page.

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