diff --git a/Exemple/MainGame.cs b/Exemple/MainGame.cs
index ab7f1a4..7f43252 100644
--- a/Exemple/MainGame.cs
+++ b/Exemple/MainGame.cs
@@ -10,7 +10,7 @@ namespace Exemple
 	{
 		enum GameState { Menu, Credit }
 
-		GraphicsDeviceManager graphics;
+		ScreenManager screen;
 		SpriteBatch spriteBatch;
 		ResourcesManager resources;
 		InputsManager inputs;
@@ -22,16 +22,7 @@ namespace Exemple
 
 		public MainGame()
 		{
-			graphics = new GraphicsDeviceManager(this);
-
-			Window.AllowUserResizing = true;
-			Window.AllowUserResizing = true;
-			Window.ClientSizeChanged += delegate
-			{
-				graphics.PreferredBackBufferWidth = Window.ClientBounds.Width;
-				graphics.PreferredBackBufferHeight = Window.ClientBounds.Height;
-				graphics.ApplyChanges();
-			};
+			screen = new ScreenManager(this);
 
 			Content.RootDirectory = "Content";
 
@@ -41,13 +32,7 @@ namespace Exemple
 
 		protected override void Initialize()
 		{
-			graphics.PreferredBackBufferWidth = 800;
-			graphics.PreferredBackBufferHeight = 600;
-			graphics.IsFullScreen = false;
-			graphics.ApplyChanges();
-
-			IsMouseVisible = true;
-
+			screen.Initialize(new Vector(800, 600), false, true, true);
 			base.Initialize();
 		}
 
@@ -73,37 +58,37 @@ namespace Exemple
 
 		protected override void Draw(GameTime gameTime)
 		{
-			graphics.GraphicsDevice.Clear(Color.DarkGray);
+			screen.Clear(Color.DarkGray);
 
 			spriteBatch.Begin();
 			ui.Texture(new Rectangle(10, 10, 200, 150), resources.Textures["Background"]);
 			switch (state)
 			{
 				case GameState.Credit:
-					ui.Box(new Rectangle(200, 100, graphics.PreferredBackBufferWidth - 400, graphics.PreferredBackBufferWidth - 200), new Colors(Color.LightGray, Color.White));
-					ui.Label(new Vector(graphics.PreferredBackBufferWidth / 2, graphics.PreferredBackBufferHeight / 4), "By Sheychen", new Colors(Color.Red, Color.OrangeRed), null, UIManager.textAlign.centerCenter);
-					if (ui.Button(new Rectangle(graphics.PreferredBackBufferWidth / 2 - 100, graphics.PreferredBackBufferHeight / 2 - 100, 200, 40), "My website"))
+					ui.Box(new Rectangle(200, 100, screen.size.X - 400, screen.size.X - 200), new Colors(Color.LightGray, Color.White));
+					ui.Label(new Vector(screen.size.X / 2, screen.size.Y / 4), "By Sheychen", new Colors(Color.Red, Color.OrangeRed), null, UIManager.textAlign.centerCenter);
+					if (ui.Button(new Rectangle(screen.size.X / 2 - 100, screen.size.Y / 2 - 100, 200, 40), "My website"))
 					{
 						Process.Start("https://sheychen.shost.ca");
 					}
-					if (ui.Button(new Rectangle(graphics.PreferredBackBufferWidth / 2 - 100, graphics.PreferredBackBufferHeight / 2 - 50, 200, 40), "Show on GitHub"))
+					if (ui.Button(new Rectangle(screen.size.X / 2 - 100, screen.size.Y / 2 - 50, 200, 40), "Show on GitHub"))
 					{
 						Process.Start("https://github.com/sheychen290/MyMonoGame");
 					}
-					if (ui.Button(new Rectangle(graphics.PreferredBackBufferWidth / 2 - 100, graphics.PreferredBackBufferHeight / 2, 200, 40), "Back"))
+					if (ui.Button(new Rectangle(screen.size.X / 2 - 100, screen.size.Y / 2, 200, 40), "Back"))
 					{
 						state = GameState.Menu;
 					}
 					break;
 
 				case GameState.Menu:
-					ui.Label(new Vector(graphics.PreferredBackBufferWidth / 2, graphics.PreferredBackBufferHeight / 4), "MyMonoGameAddin", new Colors(Color.Black, Color.Green), resources.Fonts["Title"], UIManager.textAlign.centerCenter);
-					if (ui.TextField(new Vector(graphics.PreferredBackBufferWidth / 2, graphics.PreferredBackBufferHeight / 2), ref Github, new Colors(Color.White, Color.WhiteSmoke, Color.LightGray), null, UIManager.textAlign.centerCenter, "Search on Github"))
+					ui.Label(new Vector(screen.size.X / 2, screen.size.Y / 4), "MyMonoGameAddin", new Colors(Color.Black, Color.Green), resources.Fonts["Title"], UIManager.textAlign.centerCenter);
+					if (ui.TextField(new Vector(screen.size.X / 2, screen.size.Y / 2), ref Github, new Colors(Color.White, Color.WhiteSmoke, Color.LightGray), null, UIManager.textAlign.centerCenter, "Search on Github"))
 					{
 						Process.Start("https://github.com/search?q=" + Github);
 						Github = null;
 					}
-					if (ui.Button(new Rectangle(graphics.PreferredBackBufferWidth / 2 - 100, graphics.PreferredBackBufferHeight * 3 / 4 + 50, 200, 40), "About", null, new Colors(Color.Black, Color.Green)))
+					if (ui.Button(new Rectangle(screen.size.X / 2 - 100, screen.size.Y * 3 / 4 + 50, 200, 40), "About", null, new Colors(Color.Black, Color.Green)))
 					{
 						state = GameState.Credit;
 					}
diff --git a/MyMonoGameAddin/MyMonoGameAddin.csproj b/MyMonoGameAddin/MyMonoGameAddin.csproj
index 51e3705..0057360 100644
--- a/MyMonoGameAddin/MyMonoGameAddin.csproj
+++ b/MyMonoGameAddin/MyMonoGameAddin.csproj
@@ -43,6 +43,7 @@
     <Compile Include="KeyChar.cs" />
     <Compile Include="Colors.cs" />
     <Compile Include="Skin.cs" />
+    <Compile Include="ScreenManager.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
 </Project>
\ No newline at end of file
diff --git a/MyMonoGameAddin/ScreenManager.cs b/MyMonoGameAddin/ScreenManager.cs
new file mode 100644
index 0000000..29b9b3f
--- /dev/null
+++ b/MyMonoGameAddin/ScreenManager.cs
@@ -0,0 +1,52 @@
+using System;
+using Microsoft.Xna.Framework;
+
+namespace MyMonoGameAddin
+{
+	public class ScreenManager
+	{
+		public Vector size = Vector.Zero;
+		public GraphicsDeviceManager graphics;
+		Game _game;
+
+		public ScreenManager(Game game)
+		{
+			_game = game;
+			graphics = new GraphicsDeviceManager(game);
+		}
+
+		public void Initialize(Vector buffersize, bool fullScreen, bool resizeing, bool mouse)
+		{
+			size = buffersize;
+			graphics.PreferredBackBufferWidth = size.X;
+			graphics.PreferredBackBufferHeight = size.Y;
+			graphics.IsFullScreen = fullScreen;
+			graphics.ApplyChanges();
+
+			_game.Window.AllowUserResizing = resizeing;
+			if (resizeing)
+				_game.Window.ClientSizeChanged += Window_ClientSizeChanged;
+
+			_game.IsMouseVisible = mouse;
+		}
+
+		public void Clear(Color color)
+		{
+			graphics.GraphicsDevice.Clear(color);
+		}
+
+		bool WindowSizeIsBeingChanged = false;
+		void Window_ClientSizeChanged(object sender, EventArgs e)
+		{
+			WindowSizeIsBeingChanged = !WindowSizeIsBeingChanged;
+			if (WindowSizeIsBeingChanged)
+			{
+				size.X = _game.Window.ClientBounds.Width;
+				size.Y = _game.Window.ClientBounds.Height;
+				graphics.PreferredBackBufferWidth = size.X;
+				graphics.PreferredBackBufferHeight = size.Y;
+				graphics.ApplyChanges();
+			}
+		}
+	}
+}