void IObservable <ListenButtonPressedArgs> .Notify(ListenButtonPressedArgs eventArgs)
 {
     if (_listenButtonPressed != null)
     {
         _listenButtonPressed.Invoke(this, eventArgs);
     }
 }
 void IObserver <ListenButtonPressedArgs> .OnNotified(object sender, ListenButtonPressedArgs eventArgs)
 {
     _networkController.Listen();
 }
 void IObserver <ListenButtonPressedArgs> .OnNotified(object sender, ListenButtonPressedArgs eventArgs)
 {
     (this as IObservable <ListenButtonPressedArgs>).Notify(eventArgs);
 }