public GestorPantallas()
{
graphics = new GraphicsDeviceManager(this);
graphics.PreferredBackBufferWidth = 800;
graphics.PreferredBackBufferHeight = 600;
Content.RootDirectory = "Content";
miAyuda = new Ayuda(Content);
misOpciones = new Opciones(Content);
miAnimacion = new AnimacionFinDeJuego(Content);
miPresentacion = new Presentacion(graphics, Content);
pantallaCreditos = new Creditos(graphics, Content);
miPartida = new Partida(graphics, Content);
modo = MODO_PRESENT;
}