async Task ExecuteRefreshCommand()
        {
            if (IsBusy)
            {
                return;
            }
            IsBusy = true;

            try
            {
                UserDialogs.Instance.ShowLoading("Loading Items...");
                var list = await cloudService.GetAllItemsAsync();

                Items.Clear();
                foreach (var item in list)
                {
                    Items.Add(item);
                }
                UserDialogs.Instance.HideLoading();
            }
            catch (Exception ex)
            {
                UserDialogs.Instance.HideLoading();
                UserDialogs.Instance.ShowError(ex.Message);
            }
            finally
            {
                IsBusy = false;
            }
        }