title: Tab bar and Mapview issues
body: <p>I'm really confused about this issue. I have recently been having issues with my mapview tab in my application. Even to the point of starting over again. I'm just wondering if I am the only one having this issue or am I doing something wrong here. </p>
  
  <p>I am fairly new to iOS but I know how to define a mapview's center and span in order to center on the user's location. </p>
  
  <p>I've built this in its own view and it seems to work but when I put it in a tab controller...I have an issue. The map stays zoomed out while showing the user's location.  It's supposed to show the user's location zoomed in.</p>
  
  <p>My MapViewController:</p>
  
  <pre><code>- (void)viewDidLoad
  {
      [super viewDidLoad];
      [self.mapView.delegate self];
      [self.mapView setShowsUserLocation:YES];
      // Do any additional setup after loading the view from its nib.
  }
  
  -(void)mapView:(MKMapView *)mapView
  didUpdateUserLocation:(MKUserLocation *)userLocation
  {
      CLLocationCoordinate2D loc = [userLocation coordinate];
      MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 500, 500);
      [self.mapView setRegion:region animated:YES];
  }
  </code></pre>
  
  <p>I also thought it could have something to do with the way I created the tab controller in the delegate.</p>
  
  <p>My app delegate:</p>
  
  <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
  {
      self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
      // Override point for customization after application launch.
      UIViewController *viewController1 = [[NWSWelcomeViewController alloc] initWithNibName:@"NWSWelcomeViewController" bundle:nil];
      UIViewController *viewController2 = [[NWSMapViewViewController alloc] initWithNibName:@"NWSMapViewViewController" bundle:nil];
    //  UIViewController *viewController3 = [[NWSSettingsViewController alloc] initWithNibName:@"NWSSettingsViewController" bundle:nil];
      self.tabBarController = [[UITabBarController alloc] init];
      self.tabBarController.viewControllers = @[viewController1, viewController2, /* viewController3 */];
      self.window.rootViewController = self.tabBarController;
      [self.window makeKeyAndVisible];
      return YES;
  }
  </code></pre>
  
  <p>I am writing for iOS 5.1 and I am using the latest Xcode. </p>
  
  <p>Yes, I have the settings for zooming enabled on the mapView. </p>
  
  <p>I just want to get the user location to zoom in the mapview to the user's location. </p>