How to use Ajax CalendarExtender using ModalPopupExtender?

I want to use Ajax CalendarExtender using ModalPopupExtender, but after click TextBox the Calender is shown but did not select any date.. The Calender will be enabled with false property.

 

 

 

 Default.aspx (Sourcs Code):

 

I use Ajax DLL file that is  AjaxControlToolkit.dll and also Registered.

 

 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="pm" %>

	Use of Ajax CalenderExtender with ModalPopupExtender
	Enter Date:

 

 

Here, Popup will visible, but did not select any date in Calender . That is Calender is readonly / enable = false etc.

 

 

 I want to select any date in Calender which was show that TextBox.

Please Solve the Problem.