public MainWindowViewModel(ICopyPasteController <IList <IBufferItem> > copyPasteController,
                                   IShowNotifyController showNotifyController)
        {
            ViewName = NavigationKeys.HelpView;
            App.Current.MainWindow.Deactivated += MainWindow_Deactivated;

            _buffers = copyPasteController.Buffer;
            copyPasteController.Update += CopyPasteController_Update;

            showNotifyController.ShowBuffersClick += ShowNotifyController_ShowBuffersClick;
            showNotifyController.ShowHelpClick    += ShowNotifyController_ShowHelpClick;
        }
 public NotifyViewModel(IShowNotifyController notifyContoller)
 {
     notifyContoller.CopyIsActive  += TextNotifyContoller_UpdateProps;
     notifyContoller.PasteIsActive += TextNotifyContoller_UpdateProps;
 }