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UltraDataChart marker on selected points

I am using WInforms UltraDataChart v18.1.  I have line series data of about 100 points.  I would like to mark (put a box around) selected points.  So out of the 100 points I want to mark only two.  These marks show the start and end of a baseline.

Is there any way to do this with UltraDataChart or XamDataChart?