Instantiate UIViewController from Storyboard, viewDidLoad() not executed - uiviewcontroller

Question

I'm creating a Slideout navigation controller.
Now I need to assign my MenuViewController and my TopViewController.
I have a TopViewController screen in a Storyboard that was using other type of slideout menu.
In my AppDelegate I have the following:
let storyboard : UIStoryboard! = UIStoryboard(name: "Main", bundle: nil)
let dashboard = storyboard.instantiateViewControllerWithIdentifier("DashboardView") as! DashboardViewController
let menu : SlideoutViewController = SlideoutViewController()
menu.menuEnabled = true
menu.topView = dashboard
menu.menuView = SalesViewController()
UIApplication.sharedApplication().keyWindow?.rootViewController = menu as SlideoutViewController
But when doing this the viewDidLoad method in DashboardViewController is never reached, that means that the view has not been instantiated yet.
Any clue?
UPDATE: this is a function selectView in slideout view controller
func selectView(viewController: UIViewController){
if (_internalTopNavigation != nil)
{
_internalTopNavigation!.removeFromParentViewController();
_internalTopNavigation!.view.removeFromSuperview();
}
_internalTopNavigation = UINavigationController(rootViewController: viewController)
_internalTopNavigation!.view.frame = CGRect(x: 0, y: 0,
width: _internalTopView!.view.frame.width,
height: _internalTopView!.view.frame.height)
_currentView = viewController;
_internalTopView!.addChildViewController(_internalTopNavigation!);
_internalTopView!.view.addSubview(_internalTopNavigation!.view);
if (_menuEnabled == true)
{
viewController.navigationItem.leftBarButtonItem = createMenuButton()
viewController.navigationItem.leftBarButtonItem!.tintColor = UIColor.blueColor()
}
_externalContentView = viewController;
}