TextBoxWatermarkExtender

I jsut installed AjaxToolKit.

I applied the the control to a textbox but when I run the page the watermark does not show.

What am I doing wrong?  Thanks.

<form id="form1" runat="server">
    <asp:scriptmanager ID="Scriptmanager1" runat="server"></asp:scriptmanager>

                        <asp:TextBoxWatermarkExtender ID="tweSpouseAddr" WatermarkText="Address" runat="server" TargetControlID="spouseAddr" WatermarkCssClass="watermarked">
                        </asp:TextBoxWatermarkExtender>
                    <asp:TextBox ID="spouseAddr" runat="server" Width="491px"></asp:TextBox>

</form>

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