[backtest bug] ModifyPosition and Commission 3.0

hi ..

i see bug in the new API in 3.0

ModifyPosition(position,volume)

the bug is:

backtest dont count Commission

see:

the project for test:

using System;
using System.Linq;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using cAlgo.Indicators;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class test : Robot
    {
        [Parameter(DefaultValue = 0.0)]
        public double Parameter { get; set; }

        protected override void OnStart()
        {
            Position p = ExecuteMarketOrder(TradeType.Buy, Symbol, Symbol.VolumeInUnitsMin, "", null, 1).Position;
            ModifyPosition(p, p.VolumeInUnits * 2); // double volume
        }

        protected override void OnTick()
        {

        }

        protected override void OnStop()
        {
        }
    }
}