public MainViewModel(IEventAggregator eventAggregator,
IIndex <string, IDetailViewModel> detailVmCreator,
IBasicToolBarViewModel basicToolBarViewModel,
INavigationViewModel navigationViewModel)
{
_eventAggregator = eventAggregator;
_detailVmCreator = detailVmCreator;
this.BasicToolBarViewModel = basicToolBarViewModel;
this.NavigationViewModel = navigationViewModel;
_eventAggregator
.GetEvent <SelectedDetailViewChangedEvent>()
.Subscribe(OnSelectedDetailViewChanged);
var id = _eventAggregator.GetHashCode();
}