private void BtnDelete_Click(object sender, RoutedEventArgs e)
{
vm.Delete();
}
/// <summary>
/// Calls the CustomerViewModel Delete method to Delete the selectedCustomer
/// from the CustomerView
/// </summary>
/// <param name="parameter"></param>
public void Execute(object parameter)
{
// get the Id Use that to find the customer in the database
CustomerView.Delete();
CustomerView.OnShowDialog();
}