Unfortunately we haven't been able to reproduce the problematic behavior, so we would ask you to elaborate on your specific scenario.Does this error occur only using the RadChart control or with other controls as well? And is it reproducible with older versions of the assemblies?
We are aware of an issue in design time when changing the visibility properties of certain elements, for example the ChartLegend visibility, however, if your scenario is not similar, then it would be very helpful for us if you're able to send us a sample application, in which the error is reproducible, so that our developers could look into and provide further assistance.
the Telerik team
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