Take-profit-Stop-loss-as-a-fraction-of-the-signal-bar-size

CODE:
using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Collections.Generic;

namespace WealthScript123
{
    public class MyStrategy : UserStrategyBase
    {
        //create indicators and other objects here, this is executed prior to the main trading loop
        public override void Initialize(BarHistory bars)
        {
         _L = Lowest.Series(bars.Low, 2);
         StartIndex = 2;
         PlotStopsAndLimits(3); 
        }

        //execute the strategy rules here, this is executed once for each bar in the backtest history
        public override void Execute(BarHistory bars, int idx)
        {
            if (!HasOpenPosition(bars, PositionType.Long))
            {
                //code your buy conditions here
            if (bars.Low[idx] < _L[idx - 1])
               if (bars.Close[idx] > bars.Close[idx - 1])
                  PlaceTrade(bars, TransactionType.Buy, OrderType.Stop, bars.High[idx]); 
            }
            else
            {
            //code your sell conditions here
            Position pos = LastPosition;
            int ebar = pos.EntryBar;
            ClosePosition(pos, OrderType.Stop, bars.Low[ebar]);

            double tgt = bars.High[ebar] + 2 * (bars.High[ebar] - bars.Low[ebar]);
            ClosePosition(pos, OrderType.Limit, tgt);
            }
        }

      //declare private variables below
      Lowest _L;       
    }
}