In the TrackInfoUpdated event of the track ball behavior, the event arguments have a ChartDataContext. The data context in turn has a list of DataPointInfos that are relevant to the current track ball context. These infos have references to the series of the data point which the data point info represents. You can then modify the DataPointInfo properties based on this information. Also, the event arguments have a Header property of type object that you can also set to something appropriate to the situation.
I hope this helps.
the Telerik team
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