My scenario is an ASPX page, with an ASCX user control, inside of this is a Tabstrip, and a Multipage.  Once upgrading from my 2005 version of ComponentArt to the 2009 one, suddenly several things are not working correctly - not surprising after such an upgrade.

Namely in this situation, when an <asp:ScriptManager for .NET 3.5 is placed on the page (anywhere), while the Tabstrip and Multipage are on the page, I get this javascript error:

Source: ScriptResource.axd?d=ByHQ1583t66fhQaVA-9GjR3fFXZ0LFl47ERd-m7YKLrW0sHLaLygbdshLIiaEoB1Zb7uqx3nFa2QIFsmKoWDFH3OHmRMZsqLuSi11PPqJvM1&t=ffffffffd001aff1
 
FireBug Error:
Sys.ArgumentNullException: Value cannot be null. Parameter name: element

Error Line:
[Break on this error]  {name: "element", domElement: true}\r\n
 
Error Procedure:
6576 var e = Function._validateParams(arguments, [
6577 {name: "element", domElement: true}
6578 ]);
6579 if (e) throw e;
6580 if (typeof(element.control) != 'undefined') throw Error.invalidOperation(Sys.Res.controlAlreadyDefined);
6581 Sys.UI.Control.initializeBase(this);
6582 this._element = element;
6583 element.control = this;
6584} 
 
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When I remove the script manager, it all works - but I need the functionality of the script manager, so it's hardly an option.  Thanks.