title: No top navigation bar in a tab bar controller application
body: <p>I'm pretty new in iphone programming and have stumbled upon this issue which I guess should be pretty basic stuff. </p>
  
  <p>I am using a tab bar application created from a template in XCode IOS 5.1. It works fine and creates 3 screens in the storyboard (tab bar controller + + 2 descended views) but when I try adding a top bar to these 2 views there is a problem... </p>
  
  <p>I do this by adding the top navigation bar in interface builder from object inspector for the tab bar controller. After ticking this option the top bar shows perfectly in my storyboard for all 3 screens (tabbarcontroller + 2 descended views) but after I run the project the top navigation bar is no longer there.</p>
  
  <p>What am I missing here? Why is there no top bar?</p>