Ajax 1.0 - RegisterScripControl not registering ?

Erf, should have read the release note more carefully:

The following changes have been made for extender and script controls:

ExtenderControl base class and a newScriptControl base class call on the newScriptManager.RegisterScriptDescriptors API in their Render method. Developers usingIExtenderControl andIScriptControl are required to add this call in their controls'Render method.