1 files changed, 5 insertions, 0 deletions
diff --git a/web-ui/app/js/sandbox.js b/web-ui/app/js/sandbox.js
index f9e708d6..63ce94b2 100644
--- a/web-ui/app/js/sandbox.js
+++ b/web-ui/app/js/sandbox.js
@@ -1,6 +1,11 @@
 (function () {
   'use strict';
 
+  window.addEventListener('message', function(e) {
+    var mainWindow = e.source;
+    mainWindow.postMessage('data ok', e.origin);
+  });
+
   window.onmessage = function (e) {
     if (e.data.html) {
       document.body.innerHTML = e.data.html;