Thank you for contacting us.
If I understand you correctly, you want to have some data points styled in a different way. This can be achieved easily by specifying a custom PointTemplateSelector property. Your can then select different templates depending on your custom condition.
We have implemented such a scenario in our Demo application (available with the installation package) - Chart Series -> Scatter Points.
I hope this information is useful. Let me know if I can assist you in some other way.
the Telerik team
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