ActiveAdmin custom views which retain the ActiveAdmin layout

I have a rails 3 app with the ActiveAdmin gem. My goal is to make a custom controller rendering in custom views which keep it layout. I succeeded to make a custom controller rendering in custom views with this code : pages.rb : ActiveAdmin.register_page 'Pages' do content only: :index do render 'index' end content only: :edit do render partial: 'edit' end controller do def index @search = Page.inc