calling controllers with hook

[eluser]Unknown[/eluser]
Thanks for the reply Collin,

I know I can do it easily by extending the controller but I dont want to do that.
I wanted to manage this with a hook.

Yes, even though its a pre controller hook, the controller hook works fine as expected .. the problem is when the CI processes the request further I get this error.

I tried with post_controller_constructor and post_controller the controller hook doesnt work.

regds,
Shikhar