title: IUNavigationController loading more viewControllers
body: <p>Not a Noob as yesterday, but still green.
  I have a UITabbarcontoller and a IUNavigationController they seem to work fine. I have a UITableviewController  to which I loads my NSMutable array. The user clicks a cell and didSelectRowAtIndexPath xib is loaded onto the stack.  I have a 'Learn More' button on the current xib.  I've tried a few approaches to load a newer xib when the 'Learn More' button is pressed but have failed.  Im thinking it has to do with the Navigation Controller? Do I need to import the navigationcontroller to every ViewControllerSubclass I make? Thanks.</p>