title: Uncaught ReferenceError: Polymer is not defined after event.preventDefault()
body: <p>I am getting the following error:</p>
  
  <pre><code>Uncaught ReferenceError: Polymer is not defined
  </code></pre>
  
  <p>when I click on the link on the following element:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;script src="bower_components/platform/platform.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
      &lt;my-element id="my_element"&gt;&lt;/my-element&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  
  &lt;link rel="import" href="bower_components/polymer/polymer.html"&gt;
  &lt;polymer-element name="my-element"&gt;
      &lt;template&gt;
          &lt;a href="#" on-tap="{{linkClicked}}"&gt;my link&lt;/a&gt;
      &lt;/template&gt;
      &lt;script&gt;
          Polymer('my-element', {
              linkClicked: function(event, detail, sender) {
                  event.preventDefault();
              }
          });
      &lt;/script&gt;
  &lt;/polymer-element&gt;
  </code></pre>
  
  <p>Is this a Polymer bug or am I doing something wrong?</p>
  
  <p><a href="http://jsbin.com/cuxep/1/edit?html,output" rel="nofollow">http://jsbin.com/cuxep/1/edit?html,output</a></p>