private void btnNeueGans_Click(object sender, RoutedEventArgs e)
{
Gans gans = new Gans();
cbxTiere.Items.Add(gans);
cbxTiere.SelectedItem = gans;
}
private void btnNeueGans_Click(object sender, EventArgs e)
{
Gans gans = new Gans("Neue Gans");
gans.EigenschaftGeaendert += Gefluegel_EigenschaftGeaendert;
cbxTiere.Items.Add(gans);
cbxTiere.SelectedItem = gans;
}