title: Wordpress wp_nav_menu code to display child pages
body: <p>Using the <strong>wp_nav_menu</strong> function I need to achieve the following list structure.</p>
  
  <ul>
  <li>Page 1
  <ul>
  <li>page 1 child</li>
  <li>page 1 child</li>
  <li>page 1 child</li>
  </ul></li>
  <li>Page 2
  <ul>
  <li>page 2 child</li>
  <li>page 2 child</li>
  <li>page 2 child</li>
  </ul></li>
  <li>Page 3
  <ul>
  <li>page 3 child</li>
  <li>page 3 child</li>
  <li>page 3 child</li>
  </ul></li>
  </ul>
  
  <p>For some reason I cannot work this out and I am sure I have done this successfully in the past.</p>
  
  <p>Any help/snippets would be greatly appreciated.</p>
  
  <p>It's important I use the wp_nav_menu function and not list pages.</p>
  
  <p>Thank you.</p>
  
  <p>Dan</p>