private void EditCar_Click(object sender, RoutedEventArgs e)
{
Car car = (Car)lstCars.SelectedItem;
AddEditDialog aeDialog = new AddEditDialog(car, db);
aeDialog.Owner = this;
aeDialog.ShowDialog();
}
private void AddButtonClicked(object sender, RoutedEventArgs e)
{
Car car;
AddEditDialog aeDialog = new AddEditDialog(null, db);
aeDialog.Owner = this;
aeDialog.ShowDialog();
}