Futures-ETH-and-daily-intraday-data

In case of Futures Electronic Trading Hours BarHistoryCompressor method compresses bars correctly, however when displayed the lines are refreshed at midnight, which is wrong, since they have to refresh at IsFirstBarOfDay.

Also, the documentation says that IsFirst/Last BarOfDay and related methods should only be used for regular trading session, as far as I see it works for extended. Should I use them or something else, if so, how?

CODE:
namespace WealthScript2 
{
   public class BarHistoryToDailyScaleExample : UserStrategyBase
   {
      TimeSeries _dailyLows, _dailyHighs;

      public override void Initialize(BarHistory bars)
      {
         BarHistory dayBar = BarHistoryCompressor.ToDaily(bars);

         _dailyHighs = TimeSeriesSynchronizer.Synchronize(dayBar.High, bars.Close);
         PlotTimeSeries(_dailyHighs, "Daily High", "Price", WLColor.Red, PlotStyle.Dots);

         _dailyLows = TimeSeriesSynchronizer.Synchronize(dayBar.Low, bars.Close);
         PlotTimeSeries(_dailyLows, "Daily Low", "Price", WLColor.Green, PlotStyle.Dots);
      }

      public override void Execute(BarHistory bars, int idx)
      {
         if (bars.IsFirstBarOfDay(idx))
            SetBackgroundColor(bars, idx, WLColor.Green);
         if (bars.IsLastBarOfDay(idx))
            SetBackgroundColor(bars, idx, WLColor.Red);
      }
   }
}