I assume that when you say "column chart" you actually mean RadCartesianChart with BarSeries. Please note that for visualizing each bar of the series, the RadCartesianChart creates different border component hence changing its color is possible. However, using the LineSeries is different. In this case the RadCartesianChart creates only one Path component. This means that only one color per series can be set.
However, you can achieve your requirement by creating different series for the different segments and apply different colors to them.
I hope this information is helpful.
Pavel R. Pavlov
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