diff --git a/dev/js/src/buttongroup.js b/dev/js/src/buttongroup.js
index 443d650..cb6a95c 100644
--- a/dev/js/src/buttongroup.js
+++ b/dev/js/src/buttongroup.js
@@ -98,6 +98,7 @@
     bind : function (obj) {
       if (obj !== undefined) {
         this._bind = obj;
+        return this;
       };
       return this._bind || this;
     },