Is it possible to get major grid lines for the _secondary_ y-axis for charts in Calc?

[overbarg]

I can Insert | Grids… but that only seems to allow me to add gridlines for the primary X, Y, and (Z) axes, no mention of secondary. Failing that - does anyone know of a workaround? Maybe I have to add another data series…

[catbill]

I have the same question. Hope someone can answer.