private void BuyPotionButton_Click(object sender, System.Windows.RoutedEventArgs e) { if (GameViewModel.Instance.GoldCounter >= potion.Price) { GameViewModel.Instance.GoldCounter -= this.potion.Price; GameViewModel.Instance.MainCastle.PotionStock.Add(potion.DuplicatePotion()); } else { int missingGold = potion.Price - GameViewModel.Instance.GoldCounter; System.Windows.MessageBox.Show("Il vous manque " + missingGold + " d'or monseigneur"); } }