private void EditOwner_Click(object sender, RoutedEventArgs e)
{
OwnerWindow ownwin = new OwnerWindow(Owner.SelectedItem as Owner_Card);
ownwin.Show();
}
private void AddOwner_Click(object sender, RoutedEventArgs e)
{
OwnerWindow ownwin = new OwnerWindow(new Owner_Card());
ownwin.Show();
}