UPDATE: Nov 17th 2014 – Select DataPoint, Series, Drag DataPoint examples
We now have a series of tutorials on the Custom ChartModifier API in our Knowledgebase covering the following topics:
We don’t have an API to select points per-se. What you can do though is create a Custom ChartModifierBase derived class and override OnModifierMouseDown, OnModifierMouseUp and perform point selection yourself.
You are aware of our Hit-Test API and Coordinate Conversion API. Using these you could create a small ellipse or marker and set it over the chart. See ChartModifierBase.ModifierSurface. This is a Canvas which is over all elements in the chart and used by the Modifiers (zoom, cursor) to overlay elements.
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