# File lib/ruport/controller.rb, line 431
    def render(format, add_options=nil)
      rend = build(format, add_options) { |r|
          yield(r) if block_given?   
        r.setup if r.respond_to? :setup
      }  
      rend.run
      rend.formatter.save_output(rend.options.file) if rend.options.file
      return rend.formatter.output
    end