Chart colours

I have a chart on task status, where we use the terms Red, Yellow, Green. Is it possible to set the chart so that Red is always shown as red, etc?
I can’t set the default colour order, because there are instances where not all categories are used.
E.g. if i setup red as the first colour, and there are no instances of red in the model, the next series (yellow) will show as red.

You should check out this forum conversation:  http://community.skuid.com/skuid/topics/have-certain-colors-represent-certain-values-in-charts