code: protected void init() {
  		addPropertyChangeListener(ENABLED_PROPERTY, new PropertyChangeListener() {
  
  			public void propertyChange(PropertyChangeEvent evt) {
  				validatingUpdated();
  			}
  
  		});
  		validationResultsModel.addPropertyChangeListener(ValidationResultsModel.HAS_ERRORS_PROPERTY,
  				childStateChangeHandler);
  	}
docs: Initialization of DefaultFormModel. Adds a listener on the Enabled
  property in order to switch validating state on or off. When disabling a
  formModel, no validation will happen.