private void BtnNew_Click(object sender, RoutedEventArgs e)
{
NewCDWindow newWindow = new NewCDWindow(null);
newWindow.ShowDialog();
Repository repository = Repository.GetInstance();
_cds = repository.GetAllCds();
listBoxCds.ItemsSource = _cds;
}
private void BtnEdit_Click(object sender, RoutedEventArgs e)
{
NewCDWindow editWindow = new NewCDWindow(listBoxCds.SelectedItem as Cd);
editWindow.ShowDialog();
Repository repository = Repository.GetInstance();
_cds = repository.GetAllCds();
listBoxCds.ItemsSource = _cds;
}