title method
Implementation
String? title(IRef contact) {
// if (maidenName == null && nickName == null && gender != null) {
if (nickName == null && gender != null) {
return gender.toString();
}
// if (maidenName != null) return "Maiden Name: $maidenName";
if (nickName != null) return "Nickname: $nickName";
return null;
}