You can use a style for the additional axis, with the proper color. This may look something like this:
<Style x:Key="AxisLineStyle" TargetType="Line">
<Setter Property="Stroke" Value="Orange"/>
<Setter Property="StrokeThickness" Value="5"/>
then, in the code behind, you can set the style in question directly to the additional y axis:
AxisY axisY = new AxisY();
axisY.AxisName = "AxisY_South";
axisY.Title = "Kilowatt [kW]";
axisY.AxisStyles.AxisLineStyle = this.Resources["AxisLineStyle"] as Style;
I hope this gets you started properly.
All the best,
the Telerik team
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