private void AddCar()
{
var car = new CarViewModel();
var dialog = new EditCarWindow(car, false);
var result = dialog.ShowDialog();
if (result == true)
{
var seller = (SellerViewModel)cBoxGroup.SelectedItem;
int sIndex = sellers.IndexOf(seller);
sellerService.AddCarToSeller(seller.SellerId, car);
dialog.Close();
ResetCollection();
cBoxGroup.SelectedIndex = sIndex;
lBox.SelectedIndex = seller.Cars.IndexOf(seller.Cars.Last());
}
}