Thank you for writing.
Although currently this is not supported by RadChartView you can use a custom format provider in order convert the values. Please note that in order this to work properly you should set negative point values:
MyCustomFormatProvider : ICustomFormatter, IFormatProvider
arg, IFormatProvider formatProvider)
Also you can change the provider like this:
LinearAxis verticalAxis = radChartView1.Axes.Get<LinearAxis>(1);
I have attached a sample project to show you how this works in a complete project.
I hope this will be useful. Should you have further questions, I would be glad to help.
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