I have a universal app that uses storyboards. There is an iPhone storyboard and an iPad storyboard. However, in interface builder, the viewcontrollers for the iPad storyboard are still sized for the iPhone. How do I get the iPad storyboard to show iPad sized view controllers? 

I realize that the view controller display in interface builder is design-time-only eye-candy, but having iPhone sized VCs makes it really hard to lay out the UI correctly.