title: Displaying a paper-toast polymer element in dart
body: <p>Does anyone know how to show a paper-toast polymer element from dart. The only examples I can find use <br><br>
  <code>&lt;paper-button raised onclick="document.querySelector('#toast1').show()"&gt;Discard Draft&lt;/paper-button&gt;</code></p>
  
  <p>I have tried using <code>$['myToast'].show()</code> in my dart code but it doesn't seem to work. I have also tried using the querySelector and calling show() but I get a warning that show is not a method. If there isn't a way to do this from dart is there a way to call the javascript that will show the toast from dart?</p>