title: paper-dialog not opening on click of an button
body: <p>Higuys,</p>
  
  <p>as per the polymer documentation on paper dialog i did this</p>
  
  <pre><code>&lt;paper-card elevation=3 align="center" id="question-ask-card"&gt;
  
        &lt;h1 id="got-a-question"&gt;
            Got a question ?
        &lt;/h1&gt;
  
      &lt;paper-button data-dialog="Qdialog" id="askit" raised &gt;&lt;p id="ask-it"&gt;Write on Blackboard&lt;/p&gt;&lt;/paper-button&gt;
  
  &lt;/paper-card&gt;
  </code></pre>
  
  <p>and the dialog is  </p>
  
  <pre><code>  &lt;paper-dialog id="Qdialog"&gt;
  
      &lt;h1&gt;sdjafadsfasdfjhg&lt;/h1&gt;
  
      &lt;p&gt;
        aouaouwghsefjgzskdcghizbskk
      &lt;/p&gt;
  
   &lt;/paper-dialog&gt;
  </code></pre>
  
  <p>So how to link that dialog on click of that button,please help me!!!!!!!!</p>
  
  <p>Thanks in advance.</p>