I recently upgraded to xcode 4. My application uses tabbarcontroller. In old xcode 3.x, you were able to change the tabs to different types for this screenshot:

From what I collect when researching this problem, xcode 4 no longer offers this feature. Am I missing something? From what I explored, we can now remove / add tabs and then change the attributes to get the desired effect. So, for this purpose, in xcode 4, I added a new tab item and made the UINavigationController class fully await the ability to switch the "Shows Navigation Bar" with a checkbox. But the "Navigation Controller" grouping never appears. What am I missing?
Thank you for your help.