title: Why aren't my drupal 7 submenu's showing?
body: <p>I can't seem to get my sub-menus to display.</p>
  
  <p>I've gone to: Home » Administration » Structure » Menus</p>
  
  <p>Then, I've edited the parent menu and checked the tickbox that says "Show as expanded" - but still nothing.</p>
  
  <p>The code on my page.tpl.php page for the navigation I'm referring to, is as follows:</p>
  
  <pre><code>&lt;?php
  if ($page['navigation'] || $main_menu): 
  ?&gt;
  
  &lt;?php
   print theme('links__system_main_menu', array(
            'links' =&gt; $main_menu,
            'attributes' =&gt; array(
              'id' =&gt; 'nav',
              'class' =&gt; array('links', 'clearfix'),
            ),
            'heading' =&gt; array(
              'text' =&gt; t('Main menu'),
              'level' =&gt; 'h2',
              'class' =&gt; array('element-invisible'),
            ),
          )); 
  ?&gt;
  
  &lt;?php
   print render($page['navigation']); 
  ?&gt;
  &lt;?php
   endif; 
  ?&gt;
  </code></pre>
  
  <p>What am I doing wrong?</p>
  
  <p>Any help would be GREATLY appreciated.</p>