Interaction logic for PopUpExtendContract.xaml
Inheritance: TheAirline.GraphicsModel.UserControlModel.PopUpWindowsModel.PopUpWindow, INotifyPropertyChanged
        public static object ShowPopUp(AirportContract contract)
        {
            PopUpWindow window = new PopUpExtendContract(contract);
            window.ShowDialog();

            return window.Selected;
        }
        public static object ShowPopUp(AirportContract contract)
        {
            PopUpWindow window = new PopUpExtendContract(contract);

            window.ShowDialog();

            return(window.Selected);
        }