Carole,

The ItemsSource on the CategoryDateTimeXAxis works in conjuction with the DateTimeMemberPath to alert the axis to what property on your data items represents the date value for the item. Since the CategoryDateTimeXAxis will display the points spaced depending on the amount of time between them, etc. It needs to know the Date value for each item.

So, for example, if the class for your data items looked like this:

public class DataItem

{

public double Value { get; set; }

public DateTime Date { get; set; }

}

And you had the data set up as the DataContext for the chart, you might set up your CategoryDateTimeXAxis like this:

<igChart:CategoryDateTimeXAxis x:Name="xAxis" ItemsSource="{Binding} DateTimeMemberPath="Date" Label="{Date}" />

or something of that nature.

If you have 2 different series that are using the CategoryDateTimeXAxis, it really depends on how your data is aligned and sorted. If your data is in the same order for the two series and there are the same number of items, you may be able to share the same CategoryDateTimeXAxis, otherwise, you will need to create a CategoryDateTimeXAxis for each series (binding the same data to the itemssource for each as the itemssource for the series). Then, to make the time spans align, you should set the minimum and maximum values for each CategoryDateTimeXAxis to be equal.

I hope this helps. Please ask me to elaborate if something is unclear.

-Graham