Set newDatabaseConfigs = new TreeSet(new PropertyListSet());
Set newDatabaseConfigs = new HashSet();
  public void removeDatabaseConfig(EODatabaseConfig _databaseConfig) {    Set oldDatabaseConfigs = myDatabaseConfigs;    Set newDatabaseConfigs = new TreeSet(new PropertyListSet());    newDatabaseConfigs.addAll(myDatabaseConfigs);    newDatabaseConfigs.remove(_databaseConfig);    myDatabaseConfigs = newDatabaseConfigs;    firePropertyChange(EOModel.DATABASE_CONFIGS, oldDatabaseConfigs, myDatabaseConfigs);    _databaseConfig._setModel(null);  }