MaskedEditExtender not working on Textbox

Hello,

I'm trying to make a masked date textbox to enter dates. I'm using the code showned below. This is not working.

Can someone give me an idea of what can be the problem?

Thanks,

jppinto

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
.
.
.
 
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
   <ContentTemplate>
                    
      <asp:TextBox ID="txtDias" runat="server" Width="100px"></asp:TextBox>&nbsp;
      <cc1:MaskedEditExtender ID="MaskedEditExtender1" runat="server" Mask="99/99/9999" MaskType="Date" TargetControlID="txtDias" PromptCharacter="_"> </cc1:MaskedEditExtender>
 
      <cc1:MaskedEditValidator ID="MaskedEditValidator1" runat="server" ControlExtender="MaskedEditExtender1" ControlToValidate="txtDias" EmptyValueMessage="Date is required" InvalidValueMessage="Date is invalid" IsValidEmpty="False" TooltipMessage="Input a Date"></cc1:MaskedEditValidator>
 
   </ContentTemplate>
</asp:UpdatePanel>

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