diff --git a/src/base/single/button/button.node.js b/src/base/single/button/button.node.js
index 8e17a4ea5..23403f1b9 100644
--- a/src/base/single/button/button.node.js
+++ b/src/base/single/button/button.node.js
@@ -11,7 +11,8 @@ BI.NodeButton = BI.inherit(BI.BasicButton, {
         var conf = BI.NodeButton.superclass._defaultConfig.apply(this, arguments);
         return BI.extend(conf, {
             _baseCls: (conf._baseCls || "") + " bi-node",
-            open: false
+            open: false,
+            once: false,
         });
     },
 
@@ -27,10 +28,6 @@ BI.NodeButton = BI.inherit(BI.BasicButton, {
         this.setOpened(!this.isOpened());
     },
 
-    isOnce: function () {
-        return false;
-    },
-
     isOpened: function () {
         return !!this.options.open;
     },