diff --git a/bi/widget.js b/bi/widget.js
index 9d27e764f..ad14454c0 100644
--- a/bi/widget.js
+++ b/bi/widget.js
@@ -966,7 +966,7 @@ BI.ArrangementDroppable = BI.inherit(BI.Widget, {
 
     _defaultConfig: function () {
         return BI.extend(BI.ArrangementDroppable.superclass._defaultConfig.apply(this, arguments), {
-            baseCls: "bi-arrangement-droppable"
+            baseCls: "bi-arrangement-droppable bi-resizer"
         });
     },
 
diff --git a/docs/widget.js b/docs/widget.js
index 9d27e764f..ad14454c0 100644
--- a/docs/widget.js
+++ b/docs/widget.js
@@ -966,7 +966,7 @@ BI.ArrangementDroppable = BI.inherit(BI.Widget, {
 
     _defaultConfig: function () {
         return BI.extend(BI.ArrangementDroppable.superclass._defaultConfig.apply(this, arguments), {
-            baseCls: "bi-arrangement-droppable"
+            baseCls: "bi-arrangement-droppable bi-resizer"
         });
     },
 
diff --git a/src/widget/arrangement/arrangement.droppable.js b/src/widget/arrangement/arrangement.droppable.js
index eeb225237..9ec33ee0c 100644
--- a/src/widget/arrangement/arrangement.droppable.js
+++ b/src/widget/arrangement/arrangement.droppable.js
@@ -9,7 +9,7 @@ BI.ArrangementDroppable = BI.inherit(BI.Widget, {
 
     _defaultConfig: function () {
         return BI.extend(BI.ArrangementDroppable.superclass._defaultConfig.apply(this, arguments), {
-            baseCls: "bi-arrangement-droppable"
+            baseCls: "bi-arrangement-droppable bi-resizer"
         });
     },