Indeed we are aware of this intellisense problem with Visual Studio 12 RC -- in fact it is not limited only to the DataVisualization assembly e.g. the same problem occurs if you add MediaPlayer assembly reference as well. We have already contacted Microsoft on this one and we are currently researching whether the problem is related to the Visual Studio itself, or there is something specific about our assemblies that we can change in order to address the problem but right now we cannot commit a timeframe for the resolution of this issue.
We are sorry for the inconvenience.
the Telerik team
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