I am seeing some strange behavior with the XamDataChart for data occurring on the same day. I have created the following simple XAML and code-behind to show this issue. I have 4 data points to display and I am using a PointSeries to display it. There are two data points for 02/01/2014 one with a value of 1000 and the second with a value of 3000. The XamDataChart will only ever draw the smaller of the two values. The order of the data does not seem to have any affect. I cannot get theXamDataChart to draw the data point with a value of 3000 for 02/01/2014. Below is my sample XAML and code-behind.

<ig:XamDataChart>

    <ig:XamDataChart.Axis>
        <ig:CategoryDateTimeXAxis x:Name=”xAxis”
                                  ItemsSource=”{Binding}“ DateTimeMemberPath=”Date”
                                  MinimumValue=”01/01/2014” MaximumValue=”05/01/2014” />
        <igNumericYXAxis x:Name=”yAxis” MinimumValue=”0” MaximumValue=”5000” />
    <ig:XamDataChart.Axis>

    <ig:XamDataChart.Series>
        <ig:PointSeries MarkerType=”Circle” ItemsSource=”{Binding}” ValueMemberPath=”Value1”
                        XAxis=”{Binding ElementName = xAxis}” YAxis=”{Binding ElementName yAxis}” />
    </ig:XamDataChart.Series>

</ig:XamDataChart>

public partial class MainWindow : Window {
  public MainWindow(){
    InitializeComponents();
    DataContext = ChartData.GenerateData();
  }
}

public class CharData{
  public DateTime Date {get; set;}
  public long Value1 {get; set;}
 
  public static ObservableCollection<ChartData> GenerateData() {
    ObservableCollection<ChartData> data = new ObservableCollection<ChartData>(){
      new ChartData() {
        Date = DateTime.Parse(“02/01/2014”),
        Value1 = 1000
      },
      new ChartData() {
        Date = DateTime.Parse(“03/01/2014”),
        Value1 = 2000
      },
      new ChartData() {
        Date = DateTime.Parse(“04/01/2014”),
        Value1 = 3000
      },
      new ChartData() {
        Date = DateTime.Parse(“02/01/2014”),
        Value1 = 3000
      },
    };
    return data;
  }
}