private async void AppBarButtonAddPersonGroup_Click(object sender, RoutedEventArgs e)
        {
            if (null == personGroupListView.SelectedItem || ((PersonGroups)personGroupListView.SelectedItem).name.Equals("..."))
            {
                if (txtPersonGroup.Text.Trim() != "" && txtPersonGroup.Text != "...")
                {
                    this.IsEnabled = false;
                    personGroupProgressRing.IsActive = true;

                    string response = await PersonGroupCmds.AddPersonGroups(txtPersonGroup.Text.ToLower().Replace(' ', '_'),
                                                                            txtPersonGroup.Text,
                                                                            txtPersonGroupContext.Text);

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

            AppBarButtonPersonGroupRefresh_Click(null, null);
        }