Drawing-objects-for-non-primary-symbol-disappear-after-portfolio-backtest

CODE:

public class PeakTrougAnalysis : UserStrategyBase
{
    public override string Author => "Unknown";
    public override string StrategyName => "PeakTrougAnalysis Analysis";
    public override string Description => "PeakTrougAnalysis Analysis";
    public override bool IsPrivate => false;

    public PeakTrougAnalysis() : base()
    {
        AddParameter("PeakTroughPct", ParameterType.Double, 3, 0, 100, 0.5);
    }

    // create indicators and other objects here, this is executed prior to the main trading loop
    public override void Initialize(BarHistory bars)
    {
        var peakTroughPct = Parameters[0].AsDouble;
        CalculatePeakTrougs(bars, peakTroughPct);
    }

    // execute the strategy rules here, this is executed once for each bar in the backtest history
    public override void Execute(BarHistory bars, int idx)
    { }

    private void CalculatePeakTrougs(BarHistory bars, double peakTroughPct)
    {
        // perform peak/trough analysis
        PeakTroughCalculator ptc = new(bars, peakTroughPct);
        for (int n = 1; n < ptc.PeakTroughs.Count; n++)
        {
            int x1 = ptc.PeakTroughs[n - 1].PeakTroughIndex;
            double y1 = ptc.PeakTroughs[n - 1].Value;
            int x2 = ptc.PeakTroughs[n].PeakTroughIndex;
            double y2 = ptc.PeakTroughs[n].Value;
            DrawLine(x1, y1, x2, y2, WLColor.Red, 2, LineStyle.Solid);
        }

        // render peak/trough detection delay
        foreach (PeakTrough pt in ptc.PeakTroughs)
        {
            int x1 = pt.PeakTroughIndex;
            int x2 = pt.DetectedAtIndex;
            double y = pt.Value;
            DrawLine(x1, y, x2, y, WLColor.DarkGray, 2, LineStyle.Solid);
        }
    }
}