Was looking for a way to hid some gridlines on the secondary vertical axis but haven’t found a way to accomplish this.
IChart mychrt = (IChart)myshape;
This does work as expected
mychrt.Axes.SecondaryHorizontalAxis.IsVisible = false;
This doesn’t work as i see its a read only Property
mychrt.Axes.SecondaryVerticalAxis.MinorGridLinesFormat=.AS.FillType.NoFill;