From 6a416f74093b7b082b987d8cec6bf38636b011b4 Mon Sep 17 00:00:00 2001
From: Jeongkyu Shin <inureyes@gmail.com>
Date: Mon, 12 Feb 2018 11:35:32 +0900
Subject: [PATCH]  * Bugfix : listener `track` tried to modify its DOM before
 in its constructor.

  - The element's attributes and children must not be inspected, as in the non-upgrade case none will be present, and relying on upgrades makes the element less usable
---
 paper-toggle-button.html | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/paper-toggle-button.html b/paper-toggle-button.html
index e5540e1..c78172e 100644
--- a/paper-toggle-button.html
+++ b/paper-toggle-button.html
@@ -228,13 +228,10 @@
          */
       },
 
-      listeners: {
-        track: '_ontrack'
-      },
-
       attached: function() {
         Polymer.RenderStatus.afterNextRender(this, function() {
           Polymer.Gestures.setTouchAction(this, 'pan-y');
+          this.addEventListener('track', this._ontrack.bind(this));
         });
       },