Hello John Giblin,
As I mentioned in my first reply it is not
possible to change the format of elements shown in PlotArea DataTable.
What I suggested was kind of workaround - to have the plus sign shown in SeriesItemLabels of the chart.
The reason that you don't see the plus sign added to SeriesItemLabels is that you should make SeriesItemLabels visible in your chart. You can do it like this:
myRadChart.Series.Appearance.LabelAppearance.Visible = true;
Note that you should turn Visibility on for every Series that you have in your Chart. The code snippet shows how to do it for first Series only.
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