code: public void validationResultsChanged(ValidationResults results) {
  		if (resultsModel.getMessageCount() == 0) {
  			messageReceiver.setMessage(null);
  		}
  		else {
  			ValidationMessage message = getValidationMessage(resultsModel);
  			messageReceiver.setMessage(message);
  		}
  	}
docs: Handle a change in the validation results model. Update the message
  receiver based on our current results model state.