Added lengthFieldClass indirection
diff --git a/dev/js/src/vc/choosemenu.js b/dev/js/src/vc/choosemenu.js
index 7e00d44..2ecb3b7 100644
--- a/dev/js/src/vc/choosemenu.js
+++ b/dev/js/src/vc/choosemenu.js
@@ -7,7 +7,7 @@
     create : function (params) {
       return Object.create(menuClass)
 	.upgradeTo(this)
-	._init(itemClass, undefined, params);
+	._init(itemClass, undefined, undefined, params);
     },
 
     /**