code: private void checkRunButton()
  	{
  		runButton.setEnabled((pcRadio.isSelected() ||
  			(customFileRadio.isSelected() && !modelField.getText().trim().isEmpty()) ||
  			(customURLRadio.isSelected() && !urlField.getText().trim().isEmpty()))
  			&& !outputField.getText().trim().isEmpty());
  	}
docs: Checks if the run button should be enabled.