code: private void setSelectedRadioButton(final E enumValue)
  	{
  		if (enumValue != null)
  		{
  			final JRadioButton radioButton = this.radioButtonMap.get(enumValue);
  			radioButton.setSelected(true);
  		}
  		else
  		{
  			for (final JRadioButton radioButton : this.radioButtonMap.values())
  			{
  				radioButton.setSelected(false);
  			}
  		}
  	}
docs: Sets the selected radio button.
  
  @param enumValue
  the new enum value to set