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Graph will not dipsplay with custom List! need help


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my class is inheriting Window, altho I have tried it with usercontrol as well.  when I make a list of doubles and add it to the series and then to the item source everything works perfectly.  When I make a list of XYMeasure (stole from the example).  The code will not display the graph and I get a null pointer exception when I call show dialog.  code is below:  thanks!


double Scale = 20;

this.m_Report.chart1.ItemsSource = null;this.m_Report.chart1.AxisX.ScaleUnit = 1 / Scale;

double location = -40;for (int k = 0; k < value.Length; k++)


ChartFX.WPF.SeriesAttributes series = new ChartFX.WPF.SeriesAttributes();

List<ProcessDataSummary.XYMeasure> dataPts = new List<ProcessDataSummary.XYMeasure>();for (int i = 0; i < value[k].Length; i++)


dataPts.Add(new ProcessDataSummary.XYMeasure(location, value[k]));

location += Scale;


series.ItemsSource = dataPts;






here is a copy of XYMeasure

namespace ProcessDataSummary


public class XYMeasure


private double m_x;

private double m_y;public XYMeasure(double x, double y)


m_x = x;

m_y = y;


public double X


get { return m_x; }


public double Y


get { return m_y; }






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