/// <summary>
        /// Delete all app data, including users (execept 'Everyone')
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void DeleteAllButton_Tapped(object sender, TappedRoutedEventArgs e)
        {
            var dialog = new DeleteConfirmationDialog();
            await dialog.ShowAsync();

            if (dialog.DeleteData == false)
            {
                return;
            }

            // Delete FamilyNotesData and ink.isf
            IsolatedStorageFile appLocalData = IsolatedStorageFile.GetUserStoreForApplication();

            if (appLocalData.FileExists(App.NOTES_MODEL_FILE))
            {
                appLocalData.DeleteFile(App.NOTES_MODEL_FILE);
            }

            if (appLocalData.FileExists(App.NOTES_INK_FILE))
            {
                appLocalData.DeleteFile(App.NOTES_INK_FILE);
            }

            foreach (string name in FamilyModel.Family.Select(person => person.FriendlyName).ToList())
            {
                bool success = await FamilyModel.DeletePersonAsync(name);

                Debug.Assert(success == true, "Unable to delete person");
            }
        }