Where is the basic Control-TAB (MRU) behavior in Xcode?

Question

In most multi-document editors for windowing environments, Control-TAB will utilize an MRU list to bring the user back to the last visible file. What

Answer 1

In Xcode 3 (or any Mac application) you can use Command-Tilde (⌘~) to switch between open windows.

In Xcode 4 you use ⌘} for next tab and ⌘{ for previous tab - command shift bracket.

As a side note, for some reason Xcode 4 won't let me set the key binding for previous/next tab to the standard Control-Tab. When I try it puts in Command-Control-Tab.