title: Rails & ActiveAdmin - flash.now on custom pages
body: <p>Has anyone had success implementing <code>flash.now[:notice]</code> alerts within a custom page in ActiveAdmin?</p>
  
  <p>I am using a custom page created with <code>ActiveAdmin.register_page "CustomPage"</code>.</p>
  
  <p><code>flash[:notice]</code> works, but I cannot use it because I am not using <code>redirect_to</code> so the alerts show on the incorrect page.</p>
  
  <p>My Gemfile contains <code>gem 'activeadmin', github: 'activeadmin'</code></p>
  
  <p>app/admin/test.rb</p>
  
  <pre><code>ActiveAdmin.register_page "Test" do 
    content do 
      flash.now[:notice] = 'Test'
    end
  end
  </code></pre>