Rio.cs

public class FirstViewModel 
: MvxViewModel
{
    public readonly INC<string> FirstName = new NC<string>("");
    public readonly INC<string> LastName = new NC<string>("");
    public readonly INC<TitleResponse> Title = new NC<TitleResponse>();
    public readonly INC<bool> Accepted = new NC<bool>();

    public readonly ObservableCollection<Person> People = new ObservableCollection<Person>();

    public readonly List<TitleResponse> Titles = new List<TitleResponse>()
                {
                    TitleResponse.None,
                    TitleResponse.Mr,
                    TitleResponse.Dr,
                    TitleResponse.Mrs,
                    TitleResponse.Ms,
                    TitleResponse.Miss,
                };

    public void Add()
    {
        if (!Accepted.Value)
            return;

        People.Add(new Person()
            {
                FirstName = FirstName.Value,
                LastName = LastName.Value,
                Title = Title.Value
            });

        Title.Value = TitleResponse.None;
        FirstName.Value = "";
        LastName.Value = "";
        Accepted.Value = false;
    }
}