Please refer to the support ticket you have submitted for the same issue. I am posting the reply here so that other users can see it also:
This feature is currently not supported in our charting component. You can however implement it with minimal efforts - you can overlay the chart with two line shapes and update their X,Y values according to the LayoutSlot property of the Min/Max data points. Something like:
DataPoint point =
RadRect layoutSlot = point.LayoutSlot;
// update the line shape with the layout slot position
We will put this feature in our backlog repository and will do our best to implement it as soon as possible.
I would like to thank you for your feedback and for this feature request - I have updated your Telerik points for your time.
the Telerik team
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