private void CbCustomers_SelectionEffectivelyChanged(FilterableComboBox arg1, object arg2)
        {
            var customer = arg2 as Customer;

            cbLocations.ItemsSource   = ManagementVM.Locations.Where(c => c.CustomerId == customer.Id);
            cbLocations.SelectedIndex = 0;
            var location = cbLocations.SelectedItem as Location;

            cbLocations.Text = location.ToString();
        }
 private void CbAdministrators_SelectionEffectivelyChanged(FilterableComboBox arg1, object arg2)
 {
     FilterAdministratorSelected(arg2 as AdministratorCompany);
 }