SChartData.DataPointIndex not working in Xamarin


I am using Xamarin, and need to respond to touched on chart points.

I have tried using SChartDataPoint.Index - but the value does not correlate with the index of the data item in my data-source when I have multiple series on my chart. 

It sounds link I need to use the DataPoinIndex, property, but it throws NotImplementedException…

Do you have a build with this property bound? The framework is unfortunately, not much good to me without it.