gistfile1.rb

<% content_for :sub_menu do %>
  <ul id="sub_nav" data-hook="admin_product_sub_tabs">
    <%= tab :products, :match_path => '/products' %>
    <%= tab :option_types, :match_path => '/option_types' %>
    <%= tab :properties %>
    <%= tab :prototypes %>
    <%= tab :product_groups, :match_path => '/product_groups' %>
    <%= tab :variant_datasheets, :match_path => '/variant_datasheets', :css_class => 'last' %>
  </ul>
<% end %>