private void Bird_PropertyChanged(object sender, BirdEventArgs e)
{
//MessageBox.Show($"Animal {sender as IEggProducer} has Property {e.ChangedProperty} changed.");
pgdTier.SelectedObject = sender as IEggProducer;
}
private void Chicken_PropertyChanged(object sender, BirdEventArgs e)
{
throw new NotImplementedException();
}
