This code adds the right axis to the chart with the same
values as the left axis.
Dim ch = ChartSpace1.Charts(0).SeriesCollection(1).Scalings
(ChartDimensionsEnum.chDimValues)
Dim objAxis = ChartSpace1.Charts(0).Axes.Add(ch,
ChartAxisPositionEnum.chAxisPositionRight,
ChartAxisTypeEnum.chValueAxis)