
   * Fired when the overlay is canceled, but before it is closed.
   * @event iron-overlay-canceled
   * @param {Event} event The closing of the overlay can be prevented
   * by calling `event.preventDefault()`. The `event.detail` is the original event that
   * originated the canceling (e.g. ESC keyboard event or click event outside the overlay).
   */

  /**
   * Fired after the overlay closes.
   * @event iron-overlay-closed
   * @param {Event} event The `event.detail` is the `closingReason` property
  