How to use org.jdesktop.swingx.combobox

private void appendSymfonyVersions()
{
  comboVersions.setModel(new ListComboBoxModel<>(new ArrayList<>()));
  ApplicationManager.getApplication().executeOnPooledThread(() -> {
    final List<SymfonyInstallerVersion> symfonyInstallerVersions1 = getVersions();
    if (symfonyInstallerVersions1 != null) {
      UIUtil.invokeLaterIfNeeded(() -> comboVersions.setModel(new ListComboBoxModel<>(symfonyInstallerVersions1)));
    }
  });
}

/**
 * Creates a model backed by the specified map.
 * 
 * @param map
 *                the map backing this model
 */
public MapComboBoxModel(Map<K, V> map) {
  super(buildIndex(map));
  
  this.map_data = map;
}
 

  /**
   * Selects an item from the model and returns that map value.
   * 
   * @param selectedItem
   *                selects the item at the specified index in this model
   * @return the value for the item at the selected index
   */
  public V getValue(int selectedItem) {
    return getValue(getElementAt(selectedItem));
  }
}

@Override
public int getSize() {
  return delegateModel.getSize();
}

public TwoPointPaintType getSelectedFillPaint() {
  return fillPaintModel.getSelectedItem();
}

@Override
public void removeListDataListener(ListDataListener l) {
  delegateModel.removeListDataListener(l);
}

@Override
public E getElementAt(int index) {
  return delegateModel.getElementAt(index);
}

@Override
public void addListDataListener(ListDataListener l) {
  delegateModel.addListDataListener(l);
}

  /**
   * Selects an item from the model and returns that map value.
   * 
   * @param selectedItem
   *                selects the item at the specified index in this model
   * @return the value for the item at the selected index
   */
  public V getValue(int selectedItem) {
    return getValue(getElementAt(selectedItem));
  }
}

/**
 * Creates a model backed by the specified map.
 * 
 * @param map
 *                the map backing this model
 */
public MapComboBoxModel(Map<K, V> map) {
  super(buildIndex(map));
  
  this.map_data = map;
}
 

public E getSelected() {
  return delegateModel.getSelectedItem();
}

  /**
   * Selects an item from the model and returns that map value.
   * 
   * @param selectedItem
   *                selects the item at the specified index in this model
   * @return the value for the item at the selected index
   */
  public V getValue(int selectedItem) {
    return getValue(getElementAt(selectedItem));
  }
}

/**
 * Creates a model backed by the specified map.
 * 
 * @param map
 *                the map backing this model
 */
public MapComboBoxModel(Map<K, V> map) {
  super(buildIndex(map));
  
  this.map_data = map;
}
 

@Override
public Object getSelectedItem() {
  return delegateModel.getSelectedItem();
}

  /**
   * Selects an item from the model and returns that map value.
   * 
   * @param selectedItem
   *                selects the item at the specified index in this model
   * @return the value for the item at the selected index
   */
  public V getValue(int selectedItem) {
    return getValue(getElementAt(selectedItem));
  }
}

/**
 * Creates a model backed by the specified map.
 * 
 * @param map
 *                the map backing this model
 */
public MapComboBoxModel(Map<K, V> map) {
  super(buildIndex(map));
  
  this.map_data = map;
}
 

public TwoPointPaintType getSelectedStrokePaint() {
  return strokePaintModel.getSelectedItem();
}

  /**
   * Selects an item from the model and returns that map value.
   * 
   * @param selectedItem
   *                selects the item at the specified index in this model
   * @return the value for the item at the selected index
   */
  public V getValue(int selectedItem) {
    return getValue(getElementAt(selectedItem));
  }
}

/**
 * Creates a model backed by the specified map.
 * 
 * @param map
 *                the map backing this model
 */
public MapComboBoxModel(Map<K, V> map) {
  super(buildIndex(map));
  
  this.map_data = map;
}
 

public ShapeType getSelectedType() {
  return typeModel.getSelectedItem();
}