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"

I added a scriptmanager to the form:

                ID="ScriptManager1" runat="server">

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?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

sib_userAuthor Commented:
I worked around the problem by copying the web.config file from an app where the calendarextenders displays properly.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Hi! Have you tried to delete the existing calendar extender then you can add it again from the toolbox?
sib_userAuthor Commented:

I tried that several times all with no success.
sib_userAuthor Commented:
Nobody answered the question.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
.NET Programming

From novice to tech pro — start learning today.