Centralized event streams

runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart

Index: runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart
diff --git a/runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart b/runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart
index 35fc44896ed27000f8334f53878612dc4b85adaa..42a65de74c957aecd5fc43d328f74c3c1444549a 100644
--- a/runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart
+++ b/runtime/observatory/lib/src/elements/nav/class_menu_wrapper.dart
@@ -21,13 +21,17 @@ class NavClassMenuElementWrapper extends HtmlElement {
 
   bool _last = false;
   Class _cls;
+
   bool get last => _last;
   Class get cls => _cls;
+  
   set last(bool value) {
-    _last = value; render();
+    _last = value;
+    render();
   }
   set cls(Class value) {
-    _cls = value; render();
+    _cls = value;
+    render();
   }
 
   NavClassMenuElementWrapper.created() : super.created() {
@@ -45,7 +49,9 @@ class NavClassMenuElementWrapper extends HtmlElement {
 
   void render() {
     shadowRoot.children = [];
-    if (_cls == null || _last == null) return;
+    if (_cls == null || _last == null) {
+      return;
+    }
 
     shadowRoot.children = [
       new NavClassMenuElement(cls.isolate, cls, last: last,