如何在XNA中最大化窗口

public Game1()
{
    graphics = new GraphicsDeviceManager(this);
    graphics.IsFullScreen = true;
    Content.RootDirectory = "Content";
}

protected override void LoadContent()
{
    DisplayMode displayMode = GraphicsAdapter.DefaultAdapter.CurrentDisplayMode;
    graphics.PreferredBackBufferWidth = displayMode.Width;
    graphics.PreferredBackBufferHeight = displayMode.Height;
    graphics.ApplyChanges();
}

protected override void Update(GameTime gameTime)
{
    if (Keyboard.GetState().IsKeyDown(Keys.F11))
    {
        graphics.IsFullScreen = !graphics.IsFullScreen;
        graphics.ApplyChanges();
    }
}