def to_html(options = {})
      html = []
      self.items.each do |item|
        html << item.to_html(options)
      end
      html.join
    end
def to_html(options = {})
      html = []
      self.items.each do |item|
        html << item.to_html(options)
      end
      html.join
    end
Returns all +items+ as HTML hidden field tags.