Can-we-set-Benchmark-Symbol-programatically

CODE:

using WealthLab.Backtest;
using WealthLab.Core;
using System;

namespace WealthScript3 
{
   public class MyStrategy : UserStrategyBase
   {
      //Initialize
      public override void Initialize(BarHistory bars)
      {
      }

      //Execute
      public override void Execute(BarHistory bars, int idx)
      {
      }

      //Backtest Completed (executes once)
      public override void BacktestComplete()
      {
         StrategyRunner sr = new StrategyRunner();
         foreach (BarHistory bars in BacktestData)
            sr.Symbols.Add(bars.Symbol);
         sr.BenchmarkSymbol = "SPY";
         Backtester bt = sr.RunBacktest("RSI Agita");
         WriteToDebugLog("RSI Agita on backtested data with SPY benchmark Alpha= " + bt.Metrics.Alpha.ToString("N2"));
         sr.BenchmarkSymbol = "QQQ";
         bt = sr.RunBacktest("RSI Agita");
         WriteToDebugLog("RSI Agita on backtested data with QQQ benchmark Alpha= " + bt.Metrics.Alpha.ToString("N2"));
      }

   }
}