Ajax Tookit controls behaviors not working

Hai,

Recenly i installed ajax tool kit 4.5 on 2012 visual studio.

and i try to test sample textbox watermark extender.

Register dll

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

Inside Form

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager><asp:TextBox ID="txtPhone" runat="server"></asp:TextBox><asp:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender1" TargetControlID="txtPhone" WatermarkText="000-00000" runat="server"></asp:TextBoxWatermarkExtender>

<asp:TextBox ID="txtCal" runat="server"></asp:TextBox><asp:CalendarExtender TargetControlID="txtCal" runat="server"></asp:CalendarExtender>

while compile i'm not getting any errors, and i'm net getting even water mark  effects or calender effects on browser. any  tool kit controls not working

Please Help.