title: SlideMenuController is not being shown
body: <p>I am trying to use <code>SlideMenuController</code> <a href="https://github.com/dekatotoro/SlideMenuControllerSwift" rel="nofollow">library</a> to put a left menu on <code>Home</code> screen but after passing a <code>Login</code> screen. The problem is that when I click on the button of the <code>Login</code> screen, a blank screen is being shown without the menu.</p>
  
  <p>What I have done:</p>
  
  <ul>
  <li>On <code>main.storyboard</code> I have added an <code>UIViewController</code> that has a button (that will be my future <code>Login</code> screen) and I have declared it as "Is Initial View Controller". I also have referenced this screen with <code>UIViewControllerProve</code>.</li>
  </ul>
  
  <p>On <code>UIViewControllerProve</code> I have the following code:</p>
  
  <pre><code>import UIKit
  
  class UIViewControllerProve: UIViewController {
  
      @IBAction func btnProve(sender: AnyObject) {
          createMenuView()
      }
  
      override func viewDidLoad() {
          super.viewDidLoad()
      }
  
      override func didReceiveMemoryWarning() {
          super.didReceiveMemoryWarning()
      }
  
      class ContainerViewController: SlideMenuController {
  
          override func awakeFromNib() {
              if let controller = self.storyboard?.instantiateViewControllerWithIdentifier("Main") {
                  self.mainViewController = controller
              }
              if let controller = self.storyboard?.instantiateViewControllerWithIdentifier("Left") {
                  self.leftViewController = controller
              }
              super.awakeFromNib()
          }
  
      }
  
      private func createMenuView() {
          let storyboard = UIStoryboard(name: "Main", bundle: nil)
          let mainViewController = storyboard.instantiateViewControllerWithIdentifier("MainViewController") as! MainViewController
          let leftViewController = storyboard.instantiateViewControllerWithIdentifier("LeftViewController") as! LeftViewController
          let nvc: UINavigationController = UINavigationController(rootViewController: mainViewController)
          UINavigationBar.appearance().tintColor = UIColor(hex: "689F38")
          leftViewController.mainViewController = nvc
          self.slideMenuController()?.automaticallyAdjustsScrollViewInsets = true
          let appDelegate = UIApplication.sharedApplication().delegate
          appDelegate!.window?!.backgroundColor = UIColor(red: 236.0, green: 238.0, blue: 241.0, alpha: 1.0)
          appDelegate!.window?!.rootViewController = self.slideMenuController()
          appDelegate!.window?!.makeKeyAndVisible()
          self.slideMenuController()?.openLeft()
      }
  }
  </code></pre>
  
  <ul>
  <li><p>On <code>AppDelegate.swift</code> I have commented those functions: <code>createMenuView</code> and <code>application</code>.</p></li>
  <li><p>I am taking as reference the example that the creator has in his <a href="https://github.com/dekatotoro/SlideMenuControllerSwift/releases" rel="nofollow">GitHub</a>.</p></li>
  </ul>
  
  <p>How can I make that the menu will be shown when I click on the button of my <code>Login</code> screen? Am I missing something?</p>
  
  <p>Thanks in advance!</p>