:: '''4 (CalcReason_MPChange)''' – calculation is to be initialized after market position for the instrument has been changed (for signals only).
:: '''5 (CalcReason_OrderFilled)''' – calculation is to be initialized after order filled event (for signals only).
::''' 6 (CalcReason_OrderRejected) ''' - calculation is to be initialized after order rejected event (for signals only).
:'''aiHighestDispValue''' - returns the highest price value that could be displayed on a chart.