I am unsure why you need to use a series to mimic annotations. Is it possible that you use the annotations that the chart ships with? We have grid line annotations, custom annotations, plot band annotations, marked zone annotations and custom line annotations (examples here
, help topic here
You can use the conversion api of the chart to determine the position of a tuple of values. Check the ConvertDataToPoint method of the chart. However, note that the Loaded event might be to early for the chart because at that time it might not yet know its final size. I guess you can use the SizeChanged event instead. Let us know how it goes.
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