private void btnBuildRunway_Click(object sender, RoutedEventArgs e)
        {
            Runway runway = (Runway)PopUpBuildRunway.ShowPopUp(this.Airport);

            if (runway != null)
            {
                double runwayPrice = AirportHelpers.GetAirportRunwayPrice(this.Airport, runway.Length);

                if (runwayPrice > GameObject.GetInstance().HumanAirline.Money)
                {
                    WPFMessageBox.Show(Translator.GetInstance().GetString("MessageBox", "2219"), string.Format(Translator.GetInstance().GetString("MessageBox", "2219", "message"), this.Airport.Profile.Name, runwayPrice), WPFMessageBoxButtons.Ok);
                }
                else
                {
                    WPFMessageBoxResult result = WPFMessageBox.Show(Translator.GetInstance().GetString("MessageBox", "2218"), string.Format(Translator.GetInstance().GetString("MessageBox", "2218", "message"), this.Airport.Profile.Name, runwayPrice), WPFMessageBoxButtons.YesNo);

                    if (result == WPFMessageBoxResult.Yes)
                    {
                        this.Airport.Runways.Add(runway);

                        AirlineHelpers.AddAirlineInvoice(GameObject.GetInstance().HumanAirline, GameObject.GetInstance().GameTime, Invoice.InvoiceType.Purchases, runwayPrice);

                        showRunways();
                    }
                }
            }
        }