When using the RadChart control we need to know the type of the series that you need to customize. Please elaborate more on your scenario.
On the other hand, there is an easy way to achieve the required behavior when using our new RadChartView control. You just need to create a custom style targeting the default visual of the series and you will be able to control the color of each point. If you need me to further assist you on your way, just let me know.
Pavel R. Pavlov
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