Does anyone know how to set the Text property of a DataPointLabel?

When I try to execute something like ...

MSChart1.Plot.SeriesCollection(i).DataPoints(-1).DataPointLabel.Text = "hi"

I get an "Inappropriate or invalid request" error. At this point, I go to help, and just get a list of MSChart Errors, and this one is not on the list.

I have found little information in the MSDN or Knowledge Base.

Any help?

Gregory