I know if I have ObservableCollection<ChartData> chartdata,

and chartData is { DateTime time; float value1; float value2; float value3;}, the binding from your example works.

but now I am have class ChartData { ObservableCollection<DateTime> Times,  ObservableCollection<float> Value1List;

          ObservableCollection<float> Value2List;  ObservableCollection<float> Value3List; }

I am using

<ig:CategoryDateTimeXAxis x:Name="xAxis" Label="{}{Date:hh:mm:ss}" ItemsSource="{Binding ChartData.Times}" />

it doesn't work, I don't kow what should I put for DateTimeMemberPath.

 Same for the Value1List, VAlue2List, Value3List, don't know what to put for ValueMemberPath.

Thanks,