def collection_check_boxes(method, collection, value_method, label_method, options = {}, html_options = {})
      fieldset_wrapper options[:legend_title] do
        super(method, collection, value_method, label_method, options, html_options) do |builder|
          if block_given?
            yield builder
          else
            builder.label { builder.check_box + builder.text }
          end
        end
      end
    end
def collection_check_boxes(method, collection, value_method, label_method, options = {}, html_options = {})
      fieldset_wrapper options[:legend_title] do
        super(method, collection, value_method, label_method, options, html_options) do |builder|
          if block_given?
            yield builder
          else
            builder.label { builder.check_box + builder.text }
          end
        end
      end
    end
Wrap the check_boxes collection in a custom fieldset.
 It also renders the inputs inside its labels.