As far as I can tell, there seems to be no way to determine where on a given ribbon my new commands go. For the Home ribbon, it's as the second group, for the Editor Advanced ribbon it is at the end. This seems a pointless limitation. It is very selvdom that I want to have my commands at the very start of the ribbon like that. Please add the ability to specify before/after which of the built-in groups my group should be located (as you can do in Office, for instance).