Получение синтетической позиции методом Syntetic()

if (s.Type == SecurityTypes.Option)
      {
        var xbuy = s.Synthetic(OrderDirections.Buy);
        Security fut = (Security)xbuy[0].Key;
        Security put, call;
        if (s.OptionType == OptionTypes.Put)
        {
          put = s;
          call = (Security)xbuy[1].Key;
        }
        else
        {
          put = (Security)xbuy[1].Key;
          call = s;
        }
      }