public async Task RemoveByGroup(WlanGroup group)
        {
            var tracked = new List <Wlan>(this);

            foreach (var wlan in tracked)
            {
                if (wlan.wlangroup_id == group._id)
                {
                    await Remove(wlan);
                }
            }
        }
        public async Task Add(string name, string key, UserGroup userGroup, WlanGroup wlanGroup)
        {
            await API.CreateWlan(name, key, userGroup._id, wlanGroup._id);

            await Refresh();
        }