async Task ExecuteLoadItemsCommand() { if (IsBusy) { return; } IsBusy = true; try { Items.Clear(); var items = await ItemStore.GetAsync(true); Items.ReplaceRange(items); } catch (Exception ex) { Debug.WriteLine(ex); MessagingCenter.Send(new MessagingCenterAlert { Title = "Error", Message = "Unable to load items.", Cancel = "OK" }, "message"); } finally { IsBusy = false; } }