public PitStopHandler()
 {
     _viewModel = new PitStopViewModel();
 }
 void OnRequestPitStopChanges(PitStopViewModel viewModel)
 {
     var handler = this.RequestPitStopChanges;
     if (null != handler)
         this.RequestPitStopChanges.Invoke(this, new RequestPitStopChangesArgs() { ViewModel = viewModel });
 }