Need to change tooltip after it's rendered using mutationobserver...

...but they get clobbered by the c3 mutationobserver? Seems like it anyway.

I can see my changes happen within the tooltip when I mouseover the graph but then it seems c3's mutationobserver is clobbering mine as a millisecond later the default tooltip is shown.

Is there a way to "append to" the native mutationobserver?

Thank you.