Question about grafana tooltip

I used Grafana v6.4.3 and I want to re-order series in tooltip. I’ll attached a printscreen for a good understanding.

In my printscreen you’ll see that I used a panel with a couple of bargraphs, in stack mode. One of them is noted, from bottom to top, with following letters: A, B, C. I want to reorder tooltip displayed color and name like this: top © , middle (B), bottom (A).