I’m going through:
When I created the file from New File… I expected to NSArrayController. I did not have that as a choice (Xcode 4.2.1 on 10.7.2). I had NSObject, NSDocument, NSView, NSViewController, NSWindowController. I used NSObject and manually changed CarArrayController’s header file and everything built and runs fine but I wondered if I’m missing something or if the text wasn’t as clear as it could be.