private void CbCraneOps_PopupOpening(object sender, OpenPopupEventArgs e)
{
  var combo = sender as ComboBoxEdit;
  var item = combo.ItemsSource as IEnumerable<Client.LaborMgmtSystem.RosterEntry>;
  var items = item.Where(r => r.IsActive == true);
  this.cbCraneOps.ItemsSource = items;
}