designer

designer.html

<link rel="import" href="../paper-dialog/paper-dialog.html">

<polymer-element name="my-element">

  <template>
    <paper-dialog heading="heading" backdrop layered opened="true"></paper-dialog>
  </template>

  <script>

    Polymer('my-element', {
      opened: true,
      openedChanged: function (oldValue, newValue) {
        console.log("From " + oldValue + " to " + newValue);
      }
    });

  </script>

</polymer-element>