title: Add a ContainerView inside a UIViewController created from .xib
body: <p>I have a .xib file and i want to add it a container view (to place inside a ViewController). Unfortunately a container view is only disposable by storyboard. But when i create a .xib file and i search for the container view controller, i don´t found it. Can someone give me a tips how to achieve my task? </p>