Currently, there is no way to retrieve the color of the chart items through code since the chart actually builds the style per each series item, sometimes using more than one color.
What I can suggest is extract the colors from the XAML of the RadChart and use them directly. To determine which color to use, just find the index of the DataPoint
associated with the clicked chart item (modulo the number of colors).
If you have further questions, please, open a support ticket since their response time is 24 hours, while the forums are answered in 72-hours.
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