   is: 'paper-dialog-scrollable',

    properties: {

      /**
       * The dialog element that implements `Polymer.PaperDialogBehavior` containing this element.
       * @type {?Node}
       */
      dialogElement: {
        type: Object
      }

    },

    listeners: {
      'scrollable.scroll': '_scroll'
    },

    /**
     * Returns the scrolling element.
     */
    get scrollTarget() {
      return this.$.scrollable;
    },

    ready: function () {
      this._ensureTarget();
    },

    attached: