Why can't I set the background color of the navigation controller in the storyboard?

I don’t understand why setting the background color in the storyboard does not work for my navigation controller? (See Figure)

http://ctrlv.in/299323

I set it bright red, but as you can see, it does nothing in the storyboard or application when I create it.

Any thoughts?

I know that I can set the color programmatically, and that is what I am doing now. However, it would be nice to see the changes in the storyboard, so I don’t need to create an application every time I make a color change to see the difference.