@Override
 public boolean add(final Object object) {
   if (object instanceof ParcelableStatus) {
     manager.mSelectedStatusIds.add(((ParcelableStatus) object).id);
   } else if (object instanceof ParcelableUser) {
     manager.mSelectedUserIds.add(((ParcelableUser) object).key);
   } else return false;
   final boolean ret = super.add(object);
   manager.onItemSelected(object);
   return ret;
 }