I'd like to change the tooltips in gantt chart, but the 'TooltipFormat' property does not support to what I want to do.
I want to show the tooltip that has 1) XLabel, 2)FromTime, ToTime, 3) unique string value of each (series, point) pair.
'TooltipFormat' can make first two of them, but the last one can't.
Is there any way to change the tooltip of each bar in gantt chart?