public override void OnInitialize()
        {
            base.OnInitialize();

            _pageNavigationService.For <MainPageViewModel>()
            .Navigate(true);
        }
 private void GoToEmpty()
 {
     _pageNavigationService
     .For <EmptyPageViewModel>()
     .Navigate();
 }
 private void ToMainPage()
 {
     _pageNavigationService
     .For <MainPageViewModel>()
     .Navigate(true);
 }