Change UINavigationBar with IB

Question

I'm trying to change a UINavigationController navigation bar to my custom navigation bar (subclass of UINavigationBar) with IB.
So I have a xib file with a UINavigationController , but when I stand on the navigation bar and go to the inspector to change it's class, It shows me a UINavigationItem class not UINavigationBar , and I can't choose my custom navigation bar.
What am I doing wrong?

Answer 1

To answer my own question, I found the solution in this post

Only after I tapped on the "Show Document Outline" button (the rounded arrow at the left bottom), I could find the navigationBar under the navigation controller, and change his class.