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Anytime I try to use Ajax Control Toolkit controls inside of the Control Toolkit tabs control, I get this error after the postback:
Sys.Argument.NullException: Value cannot be null.
Parameter Name: element
I've downloaded the SampleWebsite and all samples are working fine.
But, code from the tabs sample dies if I put a Calendar control in it.
Attached is the error tripped by the masked edit control after posting back to a tab.