public MainWindow()
{
InitializeComponent();
WindowStartupLocation = WindowStartupLocation.CenterScreen;
viewModel = new MainWindowViewModel();
DataContext = viewModel;
AddTakeAwayPrinters();
SetupSystemTrayIcon();
SetCheckBoxStateEvent(CheckBoxGroup.Children);
reservViewModel = new ReservationViewModel(viewModel.Settings);
reservViewModel.PropertyChanged += ReservationItem_Changed;
reservViewModel.StartGate();
}