public PersonViewAViewModel(IEventAggregator eventAggregator)
{
_eventAggregator = eventAggregator;
UpdateCommand = new DelegateCommand(Execute, CanExecute)
.ObservesProperty(() => FirstName)
.ObservesProperty(() => LastName);
PersonInfo person = PersonInfo.GetPerson(2);
Id = person.Id;
FirstName = person.FirstName;
LastName = person.LastName;
LastUpdated = person.LastUpdated;
Title = "View A";
}