How to Edit Duration Unit label in Infragistics XamGantt?

Question

I use XamGantt in WPF.

i have to use ElapsedSeconds for ProjectDurationFormat but i don't want to see the unit label in GridView.

for example

1000 esecs => 1000

how can i do?

I tried to modify DurationText property But It affects the TaskBar. (I think it has the correct format.)