Client Side error when adding a RegisterHiddenField within a UserControl preRender

[Troy]

I have a UserControl that eventually is placed within a page that uses a MasterPage.  The master page has a RadScriptManager.  In the preRender of my UserControl I am getting a reference to the scriptManager and calling: RegisterHiddenField.

When the page loads I see a client side script error in firebug.
The error is: data is undefined and appears to occur in an embedded asp.net ajax javascript file within a function with the signature of:
Function.createDelegate(this, this._scriptLoad...

I really need to get this working.  Any help you can provide will be greatly appreciated.

I am using ASP.NET AJAX RadControls version: 2010.1.519.35

[Simon]

Hello,

Does this error occur if you are using ScriptManager instead of RadScriptManager?

If it doesn't, we will need more information about your setup because calling RegisterHiddenField in our tests did not produce an error. Please give us a link to an archive with your project files or open a support ticket and send it to us there.

Greetings,
Simon
the Telerik team

[Troy]

I have resolved the issue.  I am using this in conjunction with IScriptControl to maintain client state. I just needed to add my hidden field to my ScrptControlDescriptor as an .AddElement(..).  That resolved the issue.