Hello M,

Thank you for your post.

By default, the OlapXAxis auto-generates the series that it uses based on the "DefaultSeries" property that is set on it. You can obtain these series as they are created by handling the SeriesCreating event on the OlapXAxis. The event arguments of this event has a Series property that will return you the series that is being created, and then you can set the UnknownValuePlotting property on that series to LinearInterpolate. The code to do this would look something like the following:

LineSeries series = e.Series as LineSeries;
series.UnknownValuePlotting = UnknownValuePlotting.LinearInterpolate;

I hope this helps you. Please let me know if you have any other questions or concerns on this matter.

Sincerely,
Andrew
Associate Developer
Infragistics Inc.
www.infragistics.com/support