Silverlight Page Flip Navigation

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightFlipNavigation
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            Storyboard stb1 = new Storyboard();
            stb1.Duration = new Duration(TimeSpan.FromSeconds(1));
            stb1.SpeedRatio = 3;

            DoubleAnimation daY1 = new DoubleAnimation { From = 0.00, To = 90.00 };
            Storyboard.SetTargetName(daY1, "Projection");
            Storyboard.SetTargetProperty(daY1, new PropertyPath("RotationX"));
            stb1.Children.Add(daY1);
            this.Resources.Add("EndOfPage", stb1);

            Storyboard stb = new Storyboard();
            stb.Duration = new Duration(TimeSpan.FromSeconds(1));
            stb.SpeedRatio = 3;

            DoubleAnimation daY = new DoubleAnimation { From = -90.00, To = 0.00 };
            Storyboard.SetTargetName(daY, "Projection");
            Storyboard.SetTargetProperty(daY, new PropertyPath("RotationX"));
            stb.Children.Add(daY);
            this.Resources.Add("StartOfPage", stb);

            Page1 oPage1 = new Page1();
            PageContainer.Children.Add(oPage1);
        }

        private UserControl currentPage;

        public UserControl CurrentPage
        {
            get { return this.PageContainer.Children[0] as UserControl; }
            set { currentPage = value; }
        }

        private UserControl nextPage;

        public UserControl NextPage
        {
            get { return nextPage; }
            set { nextPage = value; }
        }

        public void SwitchToPage(UserControl p)
        {
            NextPage = p;
            //if (CurrentPage != p)
            //{
                Storyboard currStb = CurrentPage.Resources["EndOfPage"] as Storyboard;
                currStb.Completed += new EventHandler(currStb_Completed);
                currStb.Begin();
            //}
        }

        void currStb_Completed(object sender, EventArgs e)
        {
            this.PageContainer.Children.RemoveAt(0);
            this.PageContainer.Children.Add(NextPage);
            Storyboard stb = NextPage.Resources["StartOfPage"] as Storyboard;
            stb.Begin();
        }

        private void Button1_Click(object sender, RoutedEventArgs e)
        {
            Page1 oPage1 = new Page1();
            SwitchToPage(oPage1);
        }
        private void Button2_Click(object sender, RoutedEventArgs e)
        {
            Page2 oPage2 = new Page2();
            SwitchToPage(oPage2);
        }
        private void Button3_Click(object sender, RoutedEventArgs e)
        {
            Page3 oPage3 = new Page3();
            SwitchToPage(oPage3);
        }
        private void Button4_Click(object sender, RoutedEventArgs e)
        {
            Page4 oPage4 = new Page4();
            SwitchToPage(oPage4);
        }
    }
}