BounceBall - XNA Farseer Magic

namespace FarseerXNADemo3.Screens
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Microsoft.Xna.Framework;
    using Microsoft.Xna.Framework.Content;
    using Microsoft.Xna.Framework.Graphics;
    using FarseerXNABase.ScreenSystem;
using FarseerXNABase.Controls;

    public class StartScreen : GameScreen
    {
        #region Properties & Variables

        private ContentManager _content;
        private Rectangle _viewport;

        private Texture2D _background, _instructionsNormal, _instructionsClicked, _highScoreNormal, _highScoreClicked;
        private PanelControl pnlMenu;

        #endregion

        #region Initialization and Load

        public StartScreen()
        {
            TransitionOnTime = TimeSpan.FromSeconds(0.5);
            TransitionOffTime = TimeSpan.FromSeconds(0.5);

            EnabledGestures = Microsoft.Xna.Framework.Input.Touch.GestureType.Tap;
        }

        public override void LoadContent()
        {
            if (_content == null)
                _content = new ContentManager(ScreenManager.Game.Services, "Content");

            _background = ScreenManager.ContentManager.Load<Texture2D>("texture");
            _instructionsNormal = ScreenManager.ContentManager.Load<Texture2D>("instructions_off");
            _instructionsClicked = ScreenManager.ContentManager.Load<Texture2D>("instructions_on");
            _highScoreNormal = ScreenManager.ContentManager.Load<Texture2D>("highscore_off");
            _highScoreClicked = ScreenManager.ContentManager.Load<Texture2D>("highscore_on");

            UpdateScreen();
            ScreenManager.Camera.ProjectionUpdated += UpdateScreen;

            CreateMenu();

            base.LoadContent();
        }
        public override void UnloadContent()
        {
            _content.Unload();
        }

        private void UpdateScreen()
        {
            Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
            _viewport = new Rectangle(0, 0, viewport.Width, viewport.Height);
        }

        #endregion

        #region Game Methods

        public override void HandleInput(InputHelper input)
        {
            pnlMenu.HandleInput(input);
            base.HandleInput(input);
        }

        public override void Update(GameTime gameTime, bool otherScreenHasFocus, bool coveredByOtherScreen)
        {
            //Update Menu states
            pnlMenu.Update(gameTime);

            base.Update(gameTime, otherScreenHasFocus, coveredByOtherScreen);
        }

        public override void Draw(GameTime gameTime)
        {
            ScreenManager.SpriteBatch.Begin();
            ScreenManager.SpriteBatch.Draw(_background, _viewport, Color.White);
            ScreenManager.SpriteBatch.End();

            Control.BatchDraw(pnlMenu, ScreenManager.GraphicsDevice, ScreenManager.SpriteBatch, Vector2.Zero, gameTime);
        }
        #endregion

        #region Menu

        private void CreateMenu()
        {
            //Initialize MenuPanel
            pnlMenu = new PanelControl();
            pnlMenu.Position = new Vector2(_viewport.Width / 2 - 160, _viewport.Height/2 - 100);

            //Add MenuItems
            //Instructions
            Button miInstructions = new Button(ScreenManager.Game)
            {
                Width = 320,
                Height = 100,
                NormalButtonTexture = _instructionsNormal,
                ClickedButtonTexture = _instructionsClicked,
                Position = new Vector2(0, 0)
            };

            //Highscore
            Button miHighScore = new Button(ScreenManager.Game)
            {
                Width = 320,
                Height = 100,
                NormalButtonTexture = _highScoreNormal,
                ClickedButtonTexture = _highScoreClicked,
                Position = new Vector2(0, 100)
            };

            //Event Handlers
            miInstructions.OnClicked += new Button.ClickHandler(miInstructions_OnClicked);
            miHighScore.OnClicked += new Button.ClickHandler(miHighScore_OnClicked);

            //Add MenuItems to Menupanel
            pnlMenu.AddChild(miInstructions);
            pnlMenu.AddChild(miHighScore);
        }

       
        void miInstructions_OnClicked(Button sender)
        {
            ScreenManager.AddScreen(new InstructionsScreen(), null);
        }
        void miHighScore_OnClicked(Button sender)
        {
           ScreenManager.AddScreen(new HighScoreScreen(), null);
        }

        #endregion
    }

}