UPDATE: When I place all the objects in the same ContentPlaceHolder, only the button is disabled. The flyoutImg and flyoutClose elements are not made visible. Another mystery?

Right; that wasn't in the initial code and you didn't describe that clear either, so it was pretty confusing.

Anyway, you may want to take a look at the section "Changing the ValidatorCallout Extenders at Run-Time" from this article: http://imar.spaanjaars.com/QuickDocId.aspx?quickdoc=413

You may need to set the ID programmatically by "finding" the Button1 control in the first Content block.

Imar

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Imar Spaanjaars
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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