How can I access instances from Interface Builder?

Hello!
How can I access instances build from the Interface Builder? For example, i know how to access Controller classes = just setting the class in the view identity. But I am missing some "connection" to my navigation controller. IB uses one, but in my code, i dont have one.
All my xibs file owners have as their identity class a View or TableView Controller. But shouldnt they have a navigation controller as identy if the View or TableView is using a navigation Controller?
thank you..

thank you, .. i know.. the problem is, that i have different xib files, but i am not sure how i can connect them with their navigation controller / tabbarcontroller.
it seems, that
NSLog(@"pushing next view..");
[[self navigationController] pushViewController:nextViewController animated:YES];
is not enough. On the console, i can read pushing next view.. but it doesnt come up to the screen.

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