Created Unassigned: Calender extender not working in AjaxControltoolkit version 3.5.7.1213 [27719]

Calender Extender control is not working after upgrading AjaxcontrolToolkit to version 3.5.7.1213.

This is how my page looks.

<%@ Register Assembly="AjaxControlToolkit, Version=3.5.7.1213, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<%@ Register Assembly="AjaxMin, Version=4.97.4951.28478, Culture=neutral, PublicKeyToken=21ef50ce11b5d80f" Namespace="AjaxControlToolkit" TagPrefix="asp" %>


<asp:ToolkitScriptManager id="ScriptManager" runat="server" EnablePageMethods="false" EnablePartialRendering="true" EnableScriptGlobalization="false" EnableScriptLocalization="true" />
<WebPartPages:SPWebPartManager id="m" runat="Server" />


Can anyone please help?