private async void AppBarButtonDeletePerson_Click(object sender, RoutedEventArgs e)
        {
            //TODO: Delete all Person - Faces - Blobs - Thumbs
            if (null != personGroupListView.SelectedItem)
            {
                this.IsEnabled = false;
                personGroupProgressRing.IsActive = true;

                string response = await PersonGroupCmds.DeletePersonGroups(((PersonGroups)personGroupListView.SelectedItem).personGroupId);

                personGroupProgressRing.IsActive = false;
                this.IsEnabled = true;
            }
            else
            {
                MessageDialog dialog = new MessageDialog("Select a person group to delete!", "Delete Error");
                await dialog.ShowAsync();
            }

            AppBarButtonPersonGroupRefresh_Click(null, null);
        }