public Yield PutGroupUsers(DreamContext context, DreamMessage request, Result <DreamMessage> response)
        {
            PermissionsBL.CheckUserAllowed(DekiContext.Current.User, Permissions.ADMIN);
            GroupBE group = GetGroupFromUrl();

            group = GroupBL.SetGroupMembers(group, request.ToDocument());
            response.Return(DreamMessage.Ok(GroupBL.GetGroupXmlVerbose(group, null)));
            yield break;
        }