Why doesn't the AJAX CalendarExtender pop up?

I declare a date field and pull the calendarextender control to
 it and the resulting markup is:

         <asp:TextBox ID="TXDATE" runat="server" Height="17px" Width="78px"
             Font-Names="Courier New"></asp:TextBox>        
         <asp:CalendarExtender ID="TXDATE_CalendarExtender" runat="server"
             TargetControlID="TXDATE">
         </asp:CalendarExtender>

I added a scriptmanager to the form:

            <asp:ScriptManager
                ID="ScriptManager1" runat="server">
            </asp:ScriptManager>

But when I run the form and clicks inside TXDATE no calendar appear.

I've done this twice before and those were the steps I recalled doing.

What am I missing?
sib_userAsked:
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sib_userAuthor Commented:
I worked around the problem by copying the web.config file from an app where the calendarextenders displays properly.
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drypzCommented:
Hi! Have you tried to delete the existing calendar extender then you can add it again from the toolbox?
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sib_userAuthor Commented:
drypz,

I tried that several times all with no success.
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sib_userAuthor Commented:
Nobody answered the question.
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