title: How to get parent navigation controller in UIView
body: <p>I have created a <code>UITabBarController</code> in my app delegate.
  where each tab bar item holds a different <code>UINavigationController</code> that loads a custom <code>UIViewController</code> with a NIB (using <code>-pushViewController:</code>).
  Inside one of the navigation controller, I load a custom <code>UIView</code> class with a custom NIB also.
  This view is loaded multiple times inside the <code>UIViewController</code>.</p>
  
  <p>The custom <code>UIView</code> has a <code>UIButton</code>, that on the event of touching it, I want to push a new <code>UIViewController</code> on the stack.
  Problem is that I 'lost' the <code>UINavigationController</code> that holds the <code>UIViewController</code>.
  I know I should use delegates, but haven't figured out who should which class should be the delegate.</p>
  
  <p>Thanks in advance!</p>