public Jeffrey_DonchianChannel(object _ctx):base(_ctx){
		
			// default 14 days
			Period = 14;			
		}		
		
		protected override void Create() {
			// create variable objects, function objects, plot objects etc.
			
			
			//plot1 = AddPlot(new PlotAttributes("ATR", EPlotShapes.Line, Color.Cyan, Color.Empty, 0, 0, true));
			
			upperBoundPlot = AddPlot(new PlotAttributes("UpperBound", EPlotShapes.Line, Color.Yellow, Color.Empty, 0, 0, true));
			lowerBoundPlot = AddPlot(new PlotAttributes("LowerBound", EPlotShapes.Line, Color.Yellow, Color.Empty, 0, 0, true));
			meanPlot = AddPlot(new PlotAttributes("Mean", EPlotShapes.Line, Color.Yellow, Color.Empty, 0, 0, true));
			
			upperBoundSeries = new VariableSeries<Double>(this);
			lowerBoundSeries = new VariableSeries<Double>(this);
			meanSeries = new VariableSeries<Double>(this);
		}
		
		protected override void StartCalc() {
			// assign inputs 
			
			//ExecInfo.MaxBarsBack = Period+1;
				
			#if DEBUG							
				Output.WriteLine("{0} - BarNumber: {1} - MaxBarsBack: {2}",
	            Bars.Time[0].ToString("yyyy/MM/dd HH:mm:ss"),
	            Bars.CurrentBarAbsolute() + 1,
	            ExecInfo.MaxBarsBack);
			#endif							
		}			
			
		
		protected override void CalcBar() {
		
			
			double upper = PublicFunctions.Highest(Bars.High, Period);
			double lower = PublicFunctions.Lowest(Bars.Low, Period);
			
			#if DEBUG			
				Output.WriteLine("Current bar is {0}", Bars.CurrentBar);
				Output.WriteLine("Date/Time: {0}, Upper: {1}, Lower: {2}", Bars.Time[0].ToString("yyyy/MM/dd HH:mm:ss"), upper, lower);
				Output.WriteLine("");
			#endif	
			
			// 0 means no displacement of the current bar
			upperBoundPlot.Set(0, upper);	
			lowerBoundPlot.Set(0, lower);	
			//meanPlot.Set(0, meanSeries.Value);	

		}
	}