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.

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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" "">

<html xmlns="">
<head runat="server">
    <form id="form1" runat="server">
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:CalendarExtender ID="TextBox1_CalendarExtender" runat="server" 
    <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    <br />
    <i>TextBox:</i><asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

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

    <br />
    <br />


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

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