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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.


file attachments

Closed Dec 14, 2013 at 2:39 AM by Superexpert


codeblazer7 wrote Feb 16, 2007 at 2:27 PM

I'm also having the same problem using ValidatorCalloutExtender, but it only happens when a ValidatorCalloutExtender is used in a non-visible tab. When used in the default tab which is initially visible, it works fine.

I'd love to nest AJAX toolkit controls within the tabs, but until this is fixed I'm not sure I can.

akula wrote Jun 6, 2007 at 8:21 PM

I'm running into a similar problem when I place sliders in the Tab control. Unless I give them a stylesheet the handles draw off and on and I get a NullException with parameter name handle and a bunch of other errors. I move out of the tab and they work fine. This is using the lastest source release. For me this problem started when design support was added to Tabs which is a shame because I was really looking forward to that.

Superexpert wrote Sep 30, 2011 at 6:59 PM

Can anyone please provide sample code related to this issue. This will help us to figure out and fix the issue.