select objects in goup

People how to select objects in goup when I double clicckin on name of goupe it expand all group, is it how it should be?? And how to add objects to group  right? What those checkboxes for in the scene explorer especially in group name?
Also how to instance the group?

People how to select objects in goup when I double clicckin on name of goupe it expand all group, is it how it should be??

Doulbe LMB on object in group to select it. or, RMB on object and use select options.

And how to add objects to group

Select object in view_port, RMB on group header and "Add selection to group"

What those checkboxes for in the scene explorer especially in group name?

They where added Mar_05_2013 with description:- "* Check boxes are added to 'Object Group' tree view, so commands can be executed on multiple nodes at the same time."
But I do not know what they actually do.

Also how to instance the group?

I do not think groups can be instanced currently, only the objects in the group can.

I think groups implemented not good. Why it is so complicated? It will be better to have simple list like in Silo with the same functionality...

I think groups implemented not good.

Other users have requested the way it currently is. Unfortunately, most users want Nvil to be like the application they have used before, so many requests are made to make changes.

Why it is so complicated?

The groups could possibly be improved, but I do not think it is complicated.