code: protected Label newButtonLabel(final String id, final String resourceKey,
  		final String defaultValue)
  	{
  		final IModel<String> labelModel = ResourceModelFactory.newResourceModel(resourceKey, this,
  			defaultValue);
  		final Label label = new Label(id, labelModel);
  		label.setOutputMarkupId(true);
  		return label;
  	}
docs: Factory method for creating the Button Label. This method is invoked in the constructor from
  the derived classes and can be overridden so users can provide their own version of a Label.
  
  @param id
  the id
  @param resourceKey
  the resource key
  @param defaultValue
  the default value
  @return the label