I have two pages with TabControls and the tabcontrols have several tabpanels. On one page there are some popupcontrol extenders on the first tab, and that page works fine. On the second page, the popupcontrolextenders are on the second tab. When that page loads, I get the following jscript error:
Microsoft JScript runtime error: Sys.ArgumentException: Value must not be null for Controls and Behaviors.
Parameter name: element
I've tried setting the Enabled property to false for these popupcontrolextenders until that tab becomes visible. This prevents the error on page load, but but then the same error happens as soon as that tab becomes visible.
Is it possible to use a popupcontrolextender on a tabpanel, or should I give up and try something different?
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