Currently, we don't have a way to simply invert a SharpChart. We do however have a way to calculate the reciprocal of any dataset and chart that. It's not exactly the same, but it is often “good enough.”
You can create a reciprocal chart by first entering the “$ONE” symbol, a colon character, and then your chosen symbol in the “Enter Ticker” box. For instance, “$ONE:INTC” will create such a chart. Example
Watch this article to learn more about creating an inverted chart.