diff --git a/src/core/index.js b/src/core/index.js
index 1937cff2e..d168cc0bc 100644
--- a/src/core/index.js
+++ b/src/core/index.js
@@ -1,3 +1,5 @@
+import OB from "./3.ob";
+import Widget from "./4.widget";
 import Action from "./action/action";
 import ShowAction from "./action/action.show";
 import Behavior from "./behavior/0.behavior";
@@ -14,6 +16,8 @@ import ResizeController from "./controller/controller.resizer";
 import TooltipsController from "./controller/controller.tooltips";
 
 BI.extend(BI, {
+    OB,
+    Widget,
     Action,
     ShowAction,
     Behavior,
@@ -31,6 +35,8 @@ BI.extend(BI, {
 });
 
 export {
+    OB,
+    Widget,
     Action,
     ShowAction,
     Behavior,