# File lib/prawn/outline.rb, line 147
    def insert_section_after(title, &block)
      @prev = items[title]
      if @prev
        @parent = @prev.data.parent
        nxt = @prev.data.next
        if block
          block.arity < 1 ? instance_eval(&block) : block[self]
        end
        adjust_relations(nxt)
      else
        raise Prawn::Errors::UnknownOutlineTitle, 
          "\n No outline item with title: '#{title}' exists in the outline tree"
      end
    end