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    public class BlockManager : DrawableGameComponent
    {
        private struct block
        {
            public Vector2 Position;
            public Color BColor;
            public block( int x, int y ) {
                Position = new Vector2( x, y );
                BColor = Color.White;
            }
        }

        private LinkedList<block> blocks;
        private Texture2D tex;
        private ContentManager content;
        private SpriteBatch spritebatch;
        private Game g;

        public BlockManager( Game ga ) : base( ga ) {
            g = ga;
            blocks = new LinkedList<block>();
            //spritebatch = new SpriteBatch( g.GraphicsDevice );
            
        }

        protected override void LoadContent() {
            content = new ContentManager( g.Services );
            content.RootDirectory = "Content";
            tex = content.Load<Texture2D>( "block" );
            spritebatch = new SpriteBatch( g.GraphicsDevice );
            base.LoadContent();
        }

        public void Add( int x, int y ) {
            blocks.AddLast( new block( x, y ) );
        }

        public void Clear() {
            blocks.Clear();
        }

        public override void Draw( GameTime gameTime ) {
            spritebatch.Begin( SpriteBlendMode.AlphaBlend );
            foreach ( block b in blocks ) {
                spritebatch.Draw( tex, b.Position, b.BColor );
            }
            spritebatch.End();

            base.Draw( gameTime );
        }

        public override void Update( GameTime gameTime ) {
            base.Update( gameTime );
        }
    }