When I click on the third group of the first group, the level is still 1 and it’s not 2.
It should be my index, starting to 0 and go on, but it stays at 1.
When I’m going to the Fiddle, I see the level 0 when I try to expand the first group.
When I try to click on the first row in the expanded group, I don’t see the level in the console.log.
