Update Sectors

src/style_manager/model/Sectors.js

@@ -1,15 +1,15 @@
-import Backbone from 'backbone';
+import { Collection } from 'common';
 import Sector from './Sector';
 
-export default Backbone.Collection.extend({
-  model: Sector,
-
+export default class Sectors extends Collection {
   initialize() {
     this.listenTo(this, 'reset', this.onReset);
-  },
+  }
 
   onReset(models, opts = {}) {
     const prev = opts.previousModels || [];
     prev.forEach(sect => sect.get('properties').reset());
   }
-});
+}
+
+Sectors.prototype.model = Sector;