async Task ExecuteLoadItemsCommand()
        {
            if (IsBusy)
            {
                return;
            }

            IsBusy = true;

            try
            {
                Items.Clear();
                var items = await CrestronDataStore.GetItemsAsync(true);

                Items.ReplaceRange(items);
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex);
                MessagingCenter.Send(new MessagingCenterAlert
                {
                    Title   = "Error",
                    Message = "Unable to load crestron rooms.",
                    Cancel  = "OK"
                }, "message");
            }
            finally
            {
                IsBusy = false;
            }
        }
        public CrestronRoomsViewModel()
        {
            Title            = "Browse Crestron Rooms";
            Items            = new ObservableRangeCollection <CrestronRoom>();
            LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand());

            MessagingCenter.Subscribe <NewCrestronRoomPage, CrestronRoom>(this, "AddCrestronRoom", async(obj, item) =>
            {
                var _item = item as CrestronRoom;
                Items.Add(_item);
                await CrestronDataStore.AddItemAsync(_item);
            });
        }