InterfaceBuilder generates this method for me in fooAppDelegate.m:

- (void)applicationDidFinishLaunching:(UIApplication *)application {    

    // Override point for customization after app launch    

    [window addSubview:[navigationController view]];
    [window makeKeyAndVisible];
}

IB also puts UIWindow *window; in fooAppDelegate.h and @synthesize window; in fooAppDelegate.m, and correspondingly for navigationController. IB generates code to release window and navigationController in dealloc.

I cannot see any code that allocates and initializes the window and the navigationController. I wonder where that happens.

Ari.