title: bringSubviewToFront not showing it's view
body: <p>In my table view controller, I have a button that when I press, I want it to show the map view, so I just did the following. However, for some reason it's not showing up the view... why is this></p>
  
  <pre><code>- (void)viewDidLoad {
      mapViewController = mapViewController = [[MapViewController alloc] init];
      [super viewDidLoad];
  }
  
  -(IBAction) toggleAction:(id) sender {
      [self.view bringSubviewToFront:mapViewController.view];
      self.navigationItem.backBarButtonItem = nil;
  
  }
  </code></pre>