private void btnCash_Click(object sender, RoutedEventArgs e) { if (cartItems.Count > 0) { CashCalcWindow ccw = new CashCalcWindow(); ccw.CalcCompletedEvent += new CashCalcWindow.CalcCompletedEventHandler(CashCalcCompleted); ccw.cartList = cartItems; //새창을 가운대로 ccw.Owner = Application.Current.MainWindow; // We must also set the owner for this to work. ccw.WindowStartupLocation = WindowStartupLocation.CenterOwner; ccw.ShowDialog(); } else { Common.PopupMessage("결제할 물건이 없습니다!"); } txtTotalAmount.Focus(); }