         }
     }
     
-    open weak var contentViewController : UIViewController? {
+    open weak var contentViewController: UIViewController? {
         willSet {
             if let contentViewController = self.contentViewController {
                 contentViewController.removeFromParentViewController()

        self.view.insertSubview(self.contentView!, at: 0)
    }
    
    override open var shouldAutorotate : Bool {
        if let topViewController = self.topViewController() {
            return topViewController.shouldAutorotate
        }

        }
    }
    
    open weak var rightViewController: UIViewController? {
        willSet {
            if let rightViewController = self.rightViewController {
                rightViewController.removeFromParentViewController()
