opened/closed.
     * @private
     */
    __openedChanged: function() {
      if (this.opened) {
        // Make overlay visible, then add it to the manager.
        this._prepareRenderOpened();
        this._manager.addOverlay(this);
        // Move the focus to the child node with [autofocus].
        this._applyFocus();

        this._renderOpened();
      } else {
        // Remove overlay, then restore the focus before actually closing.
        this._manager.removeOverlay(this);
        this._applyFoc