Thanks for getting back to me.
The DataPoint hierarchy is an abstract logical layer, used to describe the plotted data. As of Beta2 there are two distinct data point types, used to visualize particular series. The CategoricalDataPoint (derives from SingleValueDataPoint) is used to visualize CategoricalSeries - these are series that require a Linear and a Categorical axes to be properly plotted. The ScatterDataPoint is used to visualize ScatterSeries - these are series that may be plotted by two linear axes. So, a DataPoint instance is not a Silverlight visual but rather a model within the chart.
You may visualize a data point within the plot area using the PointTemplate, PointTemplates (index-based collection of templates) or PointTemplateSelector properties to apply the desired template. You may find some hints about these properties practical usage in our Examples Application. Still, the template will be visualized within the layout slot the data point occupies.
As I mentioned in my previous post, you may achieve the desired layout by overlapping the chart with some visuals. Please, feel free to open a support ticket and to attach a sample project demonstrating your scenario and I will do my best to help with some hints.
the Telerik team
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