code: protected void setFormModelDefaultEnabledState() {
  		if (getFormObject() == null) {
  			getFormModel().setEnabled(false);
  		}
  		else {
  			if (getFormObject() instanceof Guarded) {
  				setEnabled(((Guarded) getFormObject()).isEnabled());
  			}
  		}
  	}
docs: Set the form's enabled state based on a default policy--specifically,
  disable if the form object is null or the form object is guarded and is
  marked as disabled.