How-do-I-create-a-FRED-bar-history

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

namespace WealthScript5 
{
    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)
        {

         // FRED Fed Funds Data
         _rates = new Fred(bars, "ff", false, "Fed.Funds.Rate");
         PlotIndicator(_rates, WLColor.FromArgb(255, 0, 0, 255), PlotStyle.Line);
         SetPaneDrawingOptions(_rates.PaneTag, 30, 130);

         // FRED 10 Minus 2 Yield Curve
         _YieldCurve102 = new Fred(bars, "T10Y2Y", false, "10Yr.Minus2Yr.");
         PlotIndicator(_YieldCurve102, WLColor.HotPink, PlotStyle.Line);

         // FRED 10 Minus 3 Month Yield Curve
         _T10Y3M = new Fred(bars, "T10Y3M", false, "10Yr,Minus3Month");
         PlotIndicator(_T10Y3M, WLColor.DarkRed, PlotStyle.Line);

         // FRED UNEMPLOYMENT RATE
         _UNRATE = new Fred(bars, "UNRATE", false, "UnEmploymentRate");
         PlotIndicator(_UNRATE, WLColor.YellowGreen, PlotStyle.Line);

         // FRED CPI Data
         _CPI = new Fred(bars, "MEDCPIM158SFRBCLE", false, "CPI");
         PlotIndicator(_CPI, WLColor.Yellow, PlotStyle.Line);

         // FRED 10 Year Constant Maturity 
         _DGS10 = new Fred(bars, "DGS10", false, "10-Year Constant Maturity");
         PlotIndicator(_DGS10, WLColor.Orange, PlotStyle.Line);

         // FRED 30-Year Fixed Rate Mortgage Average in the United States
         _UNRATE = new Fred(bars, "MORTGAGE30US", false, "30YrMortgageRate");
         PlotIndicator(_UNRATE, WLColor.Black, PlotStyle.DashedLine);

         
         

         // White Dashed Line at Zero on Scale
         DrawHorzLine(0, WLColor.White, 1, LineStyle.Dashed, _rates.PaneTag);
         
         
        }

        //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
            }
            else
            {
                //code your sell conditions here
            }
        }

      //declare private variables below

      IndicatorBase _rates;           // Fed.Funds.Rate
      IndicatorBase _YieldCurve102;   // FRED 10 Minus 2 Yield Curve
      IndicatorBase _T10Y3M;          // FRED 10 Minus 3 Month Yield Curve
      IndicatorBase _UNRATE;          // FRED UNEMPLOYMENT RATE      
      IndicatorBase _CPI;             // FRED CPI Data      
      IndicatorBase _DGS10;           // FRED 10 Year Constant Maturity

   }
}