title: How to ECSlidingViewController without storyboard?
body: <p>I want to use ECSlidingViewController in my iOS 4.3 applications.
  And I wonder how to apply this library without storyboard?</p>
  
  <p>PLZ, how to?  this is my code, but iOS simulator's screen is white only.</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.
      //self.window.backgroundColor = [UIColor whiteColor];
  
      FrontViewController *frontViewController = [[FrontViewController alloc] initWithNibName:@"FrontViewController" bundle:nil];
      RearViewController *rearViewController = [[RearViewController alloc] initWithNibName:@"RearViewController" bundle:nil];
  
      UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:frontViewController];
  
      // create a DDMenuController setting the content as the root
      //DDMenuController *menuController = [[DDMenuController alloc] initWithRootViewController:navigationController];
      //menuController.leftViewController = rearViewController;
  
      //RevealController *menuController = [[RevealController alloc] initWithFrontViewController:navigationController rearViewController:rearViewController];
  
      ECSlidingViewController *slidingViewController = (ECSlidingViewController *)self.window.rootViewController;
      slidingViewController.topViewController = navigationController;
      slidingViewController.underLeftViewController = rearViewController;
  
      self.window.rootViewController = slidingViewController;
      [self.window makeKeyAndVisible];
      return YES;
  }
  </code></pre>