Lookup add handler

public class HomeController : Controller
{
    private DbContext Context { get; }
    private PeopleRepository Repository { get; }

    public HomeController(DbContext context, PeopleRepository repository)
    {
        Context = context;
        Repository = repository;
    }

    [HttpGet]
    public ViewResult Employ()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Employ(Int32? id, String person)
    {
        if (id == null)
            id = Repository.CreateMissing(person);

        Repository.Employ(id);

        return RedirectToAction("Index");
    }

    [HttpGet]
    public JsonResult People(LookupFilter filter)
    {
        return Json(new PeopleLookup(Context) { Filter = filter }.GetData());
    }
}

public class PeopleLookup : ALookup<Person>
{
    private DbContext Context { get; }

    public PeopleLookup(DbContext context)
    {
        Context = context;
        FilterCase = LookupFilterCase.Lower;
    }

    public override IQueryable<Person> GetModels()
    {
        return Context.Set<Person>();
    }
}

// Triggered when add new handler is enabled and user selects add new row.
lookup.addEventListener("lookupadd", e => {
    e.detail.lookup - lookup's instance.

    // Open creation modal instead of posting values.
});