Group function ??

a while ago and some years ago i mentioned that the function "group"
didn't work.
This function is still not working, i'm working a couple of years now with MV but this function isn't very clear and i can't get it work.
Is there something i do wrong? it seems to be very simple but something isn't right here. click on group then
"add selected item(s) in group"
??? here it stops 
didn't work.
This function is still not working, i'm working a couple of years now with MV but this function isn't very clear and i can't get it work.
Is there something i do wrong? it seems to be very simple but something isn't right here. click on group then


