public void addAddress(Address a)
{
addresses.Add(a);
a.addChangedListener(this);
notifyListeners(null, a.City);
notifyListeners(null, a.Country);
notifyListeners(null, a.Street);
}
public void removeAddress(Address a)
{
a.removeChangedListener(this);
notifyListeners(a.City, null);
notifyListeners(a.Country, null);
notifyListeners(a.Street, null);
addresses.Remove(a);
}