Tracking focus in Java

After a lot of experimenting I found a reliable way to track which controls are getting focus:

Component currFocus = null;

KeyboardFocusManager.getCurrentKeyboardFocusManager().addPropertyChangeListener(
  new PropertyChangeListener(){
    public void propertyChange(PropertyChangeEvent e){
      String prop = e.getPropertyName();
      if ((prop.equals("focusOwner"))){
        if(e.getNewValue() != null){
          currFocus = (Component)e.getNewValue();
        }
      }
    }
  }
);