title: Custom observer not being triggered
body: <p>I am trying to write an observer for magento that will be triggered when an order has been marked as shipped and has been given a tracking number. </p>
  
  <p>When I go in through the admin and place an order, invoice and then go to ship the function I need to call is never actually called, and I do not understand why. </p>
  
  <p>I have go through a couple of of pages on the magento website to see what I might be doing wrong, but I just cant figure it out (<a href="http://www.magentocommerce.com/wiki/5_-_modules_and_development/0_-_module_development_in_magento/customizing_magento_using_event-observer_method" rel="nofollow">http://www.magentocommerce.com/wiki/5_-_modules_and_development/0_-_module_development_in_magento/customizing_magento_using_event-observer_method</a> &amp; <a href="http://www.magentocommerce.com/knowledge-base/entry/magento-for-dev-part-2-the-magento-config" rel="nofollow">http://www.magentocommerce.com/knowledge-base/entry/magento-for-dev-part-2-the-magento-config</a>).</p>
  
  <p>Please note that I do see the module within the admin Advanced area and it is enabled.</p>
  
  <p>If anyone could look over the code I have attached and let me know where my issue is, it would be much appreciated.</p>
  
  <p>Here is my Observer class which is located in app/code/local/WR/TrackingEmail/Model/Observer.php</p>
  
  <pre><code>class WR_TrackingEmail_Model_Observer
  {
      public function sendTrackEmail($observer)
      {
          $track = $observer-&gt;getEvent()-&gt;getTrack();
          $shipment = $track-&gt;getShipment(true);
          $shipment-&gt;sendEmail();
      }
  }
  </code></pre>
  
  <p>Here is my config.xml for the module</p>
  
  <pre><code>&lt;config&gt;
      &lt;global&gt;
          &lt;modules&gt;
              &lt;wr_trackingemail&gt;
                  &lt;version&gt;0.1.1&lt;/version&gt;
              &lt;/wr_trackingemail&gt;
          &lt;/modules&gt;
          &lt;events&gt;
              &lt;sales_order_shipment_track_save_after&gt;
                  &lt;observers&gt;
                      &lt;Wr_trackingemail_model_observer&gt;
                          &lt;type&gt;singleton&lt;/type&gt;
                          &lt;class&gt;WR_TrackingEmail_Model_Observer&lt;/class&gt;
                          &lt;method&gt;sendTrackEmail&lt;/method&gt;
                      &lt;/Wr_trackingemail_model_observer&gt;
                  &lt;/observers&gt;
              &lt;/sales_order_shipment_track_save_after&gt;
          &lt;/events&gt;
      &lt;/global&gt;
  &lt;/config&gt;
  </code></pre>
  
  <p>Here is my app/etc/modules/WR_TrackingEmail.xml</p>
  
  <pre><code>&lt;config&gt;
      &lt;modules&gt;
          &lt;WR_TrackingEmail&gt;
              &lt;active&gt;true&lt;/active&gt;
              &lt;codePool&gt;local&lt;/codePool&gt;
          &lt;/WR_TrackingEmail&gt;
      &lt;/modules&gt;
  &lt;/config&gt;
  </code></pre>