private void addEntry(){
  filterModel.addNewEntry();
  extentModel.populate(null);
  removeFTCButton.setEnabled(false);
  addExtentButton.setEnabled(false);
  removeExtentButton.setEnabled(false);
}

private void addEntry ( ) { filterModel . addNewEntry ( ) ; extentModel . populate ( null ) ; removeFTCButton . setEnabled ( false ) ; addExtentButton . setEnabled ( false ) ; removeExtentButton . setEnabled ( false ) ; }
adds a new feature type constraint entry .
