Please run the attached sample project.
Stack trace:
System.NullReferenceException occurred
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=Telerik.WinControls.ChartView
StackTrace:
at Telerik.Charting.CombinedBarSeriesRoundLayoutStrategy.ApplyLayoutRoundingVertical(LayoutContext context) in c:\Work\Development\RadControls\RadChartView\Engine\Series\Combination\BarSeries\CombinedBarSeriesRoundLayoutStrategy.cs:line 206
InnerException: