//Events binded to buttons
public void LoadPageOne()
{
SelectedScreen = new FirstChildViewModel(SelectedPerson);
}
public AnotherChildViewModel(IEventAggregator eventAggregator, PersonModel personModel, FirstChildViewModel firstChildViewModel, ThirdChildViewModel thirdChildViewModel)
{
_eventAggregator = eventAggregator;
_eventAggregator.Subscribe(this);
_person = personModel;
_thirdChildViewModel = thirdChildViewModel;
}