title: Adding CSS item to Django menu
body: <p>I need to add css classes to my menu items. I can not figure out how to do that...</p>
  
  <p>I am using Django CMS, but do not want the client to alter the menu.
  This is what i have so far:</p>
  
  <pre><code>from menus.base import Menu, NavigationNode
  from menus.menu_pool import menu_pool
  from django.utils.translation import ugettext_lazy as _
  
  class MyMenu(Menu):
  
      def get_nodes(self, request):
          nodes = []
          n1 = NavigationNode(_('Start'), "/", 1)
          n2 = NavigationNode(_('Item 1'), "item1/", 2)
          n3 = NavigationNode(_('Item 2'), "item2/", 3)
          nodes.append(n1)
          nodes.append(n2)
          nodes.append(n3)
          return nodes
  
  menu_pool.register_menu(MyMenu)
  </code></pre>
  
  <p>My menu then looks like this:</p>
  
  <pre><code>&lt;ul&gt;
  &lt;li class="child selected"&gt;&lt;a href="/"&gt;Start&lt;/a&gt;&lt;/li&gt;
  &lt;li class="child sibling"&gt;&lt;a href="item1/"&gt;Item 1&lt;/a&gt;&lt;/li&gt;
  &lt;li class="child sibling"&gt;&lt;a href="item2/"&gt;Item 2&lt;/a&gt;&lt;/li&gt;              
  &lt;/ul&gt;
  </code></pre>
  
  <p>But i want it to be like this:</p>
  
  <pre><code>&lt;ul&gt;
  &lt;li class="start child selected"&gt;&lt;a href="/"&gt;Start&lt;/a&gt;&lt;/li&gt;
  &lt;li class="item1 child sibling"&gt;&lt;a href="item1/"&gt;Item 1&lt;/a&gt;&lt;/li&gt;
  &lt;li class="item2 child sibling"&gt;&lt;a href="item2/"&gt;Item 2&lt;/a&gt;&lt;/li&gt;            
  &lt;/ul&gt;
  </code></pre>
  
  <p>So i think i need a modifier, but i can not find the proper documentation.</p>
  
  <p>I am very new to Django, so i am sure i miss a lot, but step by step i hope to get it done :) Thanks in advance!</p>