Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent

Hi Sir,

     I am using an ajax tab panel extender control.Everything works fine using the control.But recently my business logic has been changed like I am having three tabs and the first tab will be enabled by default and the second and third are in disabled  mode.So user have to definitely fill the first form and then he can navigate to second and third.BUt the problem is i am enabling and disabling the tabs ffom server side and there its throwing a javascript exception.

                       How to resolve this error and could please let me know what is the root cause of this error and how can i fix it.

Exception:

Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method (Solution)

Thanks in advance,

Sushanth