////////////////Code from Page 1///////////////
namespace App2
{
    public sealed partial class MainPage
    {
        public MainPage()
        {
            InitializeComponent();
            MotionStoryboard.Begin();
        }
        private void Click_Login(object sender, RoutedEventArgs e)
        {
            Frame.Navigate(typeof (LoginPage));
        }
        private void Click_Register(object sender, RoutedEventArgs e)
        {
            Gride.Visibility = Visibility.Visible;
           MotionStory.Begin();
        }
    }
}
////////////////Code from Page 2///////////////
namespace App2
{
    public sealed partial class LoginPage : Page
    {
        public LoginPage()
        {
            InitializeComponent();
        }
        private void button_Click(object sender, RoutedEventArgs e)
        {
            Frame.Navigate(typeof(MainWindow));
        }
    }
}