Hi Ignacio,
You need to touch the FillStyles collection of the point series, whcih allows you to specify fill style per data point - for example:
Dim chart As NChart = NChartControl1.Charts(0)
chart.Enable3D = True
Dim point As NPointSeries = CType(NChartControl1.Charts(0).Series.Add(SeriesType.Point), NPointSeries)
point.InflateMargins = True
point.AddDataPoint(New NDataPoint(10, 20, 30, "MyLabel1"))
point.FillStyles.Add(0, New NColorFillStyle(Color.Red))
point.AddDataPoint(New NDataPoint(20, 30, 40, "MyLabel2"))
point.FillStyles.Add(1, New NColorFillStyle(Color.Blue))
point.DataLabelStyle.Visible = False
point.UseXValues = True
point.UseZValues = True
Let us know if you meet any probelms...
Best Regards,
Nevron Support Team