Perspective XY chart Gantt columns colors

Hello all,

I did the tuto to create a Gantt Chart : https://docs.inductiveautomation.com/display/DOC81/Perspective±+XY+Chart

I have one serie.
my question is the following :
How can i change color of my columns depending the status of my machine (ex: EXECUTING : Color1, DOWN : Color 2 )

Thanks in advance