code: protected IModel<String> newContentResourceModel(final IModel<ResourceBundleKey> resourceKey)
  	{
  		return ResourceModelFactory.newResourceModel(resourceKey.getObject(), this);
  
  	}
docs: Factory method for create a new {@link IModel} for an item of the content list. This method
  is invoked in the constructor from the derived classes and can be overridden so users can
  provide their own version of a new {@link IModel} for an item of the content list.
  
  @param resourceKey
  the resource key
  @return the {@link IModel}