title: Twitter Bootstrap - On collapse, the navbar options do not turn into a button that shows the options
body: <p>I have this markup:</p>
  
  <pre><code>&lt;div class='navbar'&gt;
              &lt;div class='navbar-inner'&gt;
                &lt;div class='container'&gt;
                  &lt;a class='btn btn-navbar' data-target='.nav-collapse' data-toggle='collapse'&gt;
                    &lt;span class='icon-bar'&gt;&lt;/span&gt;
                    &lt;span class='icon-bar'&gt;&lt;/span&gt;
                    &lt;span class='icon-bar'&gt;&lt;/span&gt;
                  &lt;/a&gt;
                  &lt;div class='nav-collapse'&gt;
                    &lt;ul class='nav'&gt;
                      &lt;li class='active'&gt;
                        &lt;a href='#'&gt;Home&lt;/a&gt;
                        &lt;a href='#'&gt;Option 2&lt;/a&gt;
                        &lt;a href='#'&gt;Option 3&lt;/a&gt;
                      &lt;/li&gt;
                    &lt;/ul&gt;
              &lt;/div&gt;
            &lt;/div&gt;
          &lt;/div&gt;
        &lt;/div&gt;
  </code></pre>
  
  <p>It renders ok when the screen is full, but when I collapse the screen, it does not show the button which expands to show the options.  Is there something I am not doing correctly? Any idea why the button is not being shown after screen collapse?</p>
  
  <p>Thanks!</p>