private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            frameNav.NavigationUIVisibility = System.Windows.Navigation.NavigationUIVisibility.Hidden;

            // Creamos IntroControl
            _introControl        = new IntroControl();
            _introControl.Width  = double.NaN;
            _introControl.Height = double.NaN;
            mainGrid.Children.Add(_introControl);

            _introControl.IntroEnded  += new IntroEndedHandler(OnIntroEnded);
            _introControl.IntroHidden += new IntroEndedHandler(OnIntroHidden);
        }
 private void OnIntroHidden(object sender, EventArgs args)
 {
     mainGrid.Children.Remove(_introControl);
     _introControl = null;
 }