Add destroy function

dev/custom-fn.js

@@ -16,10 +16,20 @@ module.exports = function() {
     }
   }
 
+  /**
+   * @returns {void}
+   */
+  function handleButtonClick() {
+    Clay.config = Clay.meta.userData.config2;
+    Clay.build();
+  }
+
   Clay.on(Clay.EVENTS.AFTER_BUILD, function() {
     var coolStuffToggle = Clay.getItemByAppKey('cool_stuff');
     toggleBackground.call(coolStuffToggle);
     coolStuffToggle.on('change', toggleBackground);
+
+    Clay.getItemById('testButton').on('click', handleButtonClick);
   });
 
   console.log('userData: ', Clay.meta.userData);