Creating-a-screener

QUOTE:
Wealth-Lab 6 offered a way to create a screener (Section 12.1 in the Programming Guide). Is there a way to create screeners in WL 7?

CODE:
protected override void Execute()
{         
   int bar = Bars.Count - 1; // the last chart bar number
   if (bar < 199) return;   // chart must have at least 200 bars to continue

   if (
     Close[bar] > SMA.Value(bar, Close, 200)
      && Lowest.Value(bar, ROC.Series(Close, 5), 200) > -20
      && SMA.Value(bar, Volume, 20) > 100000
      && RSI.Series(Close, 10)[bar] < 50           
   )
     BuyAtMarket(bar + 1);
}

CODE:
//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 (idx < bars.Count - 1) return;   // run only on the last bar... 
         if (idx < 199) return;   // chart must have at least 200 bars to continue

            if (bars.Close[idx] > SMA.Value(idx, bars.Close, 200)
            && Lowest.Value(idx, ROC.Series(bars.Close, 5), 200) > -20
            && SMA.Value(idx, bars.Volume, 20) > 100000
            && RSI.Series(bars.Close, 10)[idx] < 50
         )
            PlaceTrade(bars, TransactionType.Buy, OrderType.Market);
        }