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Custom Extender Type Or Class Is Undefined In AjaxToolkit ASP.NET

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Hi!
When running an asp.net app that includes an ajax custom extender control, a javascript alert pops up message "EXTENDER is undefined". Sample error message:
CustomExtenders.DisabledTextBehavior is undefined
where: CustomExtenders.DisabledTextBehavior is Namespace.Type

After troubleshooting for several hours, I came up with the solution:
1. Download Ajax Toolkit Stable Release for the specific .NET Framework.
 I tried versions for September release and it's not working.
2. Replace code: 
CustomExtenders.DisabledTextBehavior.registerClass('CustomExtenders.DisabledTextBehavior', AjaxControlToolkit.BehaviorBase);
To
CustomExtenders.DisabledTextBehavior.registerClass('CustomExtenders.DisabledTextBehavior', Sys.Extended.UI.BehaviorBase);
Note: AjaxControlToolkit.BehaviorBase is used in previous versions of AjaxToolkit.
Cheers!

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