class ActiveAdmin::Views::Pages::Page

def main_content
  if page_presenter.block
    instance_exec &page_presenter.block
  else
    nil
  end
end

def page_presenter
  active_admin_config.get_page_presenter(:index) || ActiveAdmin::PagePresenter.new
end

def title
  if page_presenter[:title]
    render_or_call_method_or_proc_on self, page_presenter[:title]
  else
    active_admin_config.name
  end
end