Centralized event streams

runtime/observatory/lib/src/elements/code_ref.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library code_ref_element;
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M
   show IsolateRef, CodeRef, isSyntheticCode;
@@ skipping 29 matching lines @@
 
   @override
   void attached() {
     super.attached();
     _r.enable();
   }
 
   @override
   void detached() {
     super.detached();
+    children = [];
     _r.disable(notify: true);
-    children = [];
   }
 
   void render() {
     final name = (_code.isOptimized ? '*' : '') + _code.name;
     children = [
       new AnchorElement(href: M.isSyntheticCode(_code.kind) ? null
           : Uris.inspect(_isolate, object: _code))
         ..text = name
     ];
   }
 }