title: Need to bind onclick event on drawer button
body: <p>I am working with material design lite in my project and I need to attach a function to the click event of the drawer button. I thought it was trivial, so I added this code:</p>
  
  <pre><code>$(document).ready(function(){ 
      $('.mdl-layout__drawer-button).on('click', function(){
         console.log('click');
  });
  </code></pre>
  
  <p>but then I discovered that the drawer button is added by mdl.js as the very last element after document.ready, so when I run my code, the button is not yet ready.</p>
  
  <p>Any idea on how to get the selector when it is ready?</p>