Вроде бы в примере все явно написано.

// Отрисовка графиков.
mainPane.AddList(string.Format("High({0}) [{1}]", HighPeriod, source.Symbol), high, ListStyles.LINE,
0x00ff00, LineStyles.SOLID, PaneSides.RIGHT);
mainPane.AddList(string.Format("High2({0}) [{1}]", High2Period, source.Symbol), high2, ListStyles.LINE,
0x00ff00, LineStyles.DASH, PaneSides.RIGHT);
mainPane.AddList(string.Format("Low({0}) [{1}]", LowPeriod, source.Symbol), low, ListStyles.LINE,
0xff0000, LineStyles.SOLID, PaneSides.RIGHT);
mainPane.AddList(string.Format("Low2({0}) [{1}]", Low2Period, source.Symbol), low2, ListStyles.LINE,
0xff0000, LineStyles.DASH, PaneSides.RIGHT);