Hide a Column on a Progressive Chart

[Stejawh]

Hi,

I have been working on a Progressive Chart and the Customer wants to display the last column from Zero rather than following on from the last item.  Now we can achive this by calculating ([Data Item]*-1) but we have to include this new Calc in the Chart to zero the variance so that the last Item will start from Zero.  There doesn't seem to be an obvious way to hide the Calc but include it in the chart.

Any ideas?

Regards,

Steve