From e4630f789cdfbb713f3ee9520fa49bdabbbd7fbb Mon Sep 17 00:00:00 2001
From: Alan Knowles <alan@akbkhome.com>
Date: Wed, 26 May 2010 17:37:53 +0800
Subject: [PATCH] builder.html.js

---
 builder.html.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/builder.html.js b/builder.html.js
index f0cd6550d..837e80f05 100644
--- a/builder.html.js
+++ b/builder.html.js
@@ -220,6 +220,11 @@ Builder  = {
             }
              
         }
+        if (cfg.xtype) {
+            if (typeof(cfg.xns[cfg.xtype]) == 'undefined') {
+                throw "Invalid Xtype " + this.xtreepath;
+            }
+        }
         
         // we can overlay some event handlers here..
         cfg.listeners = cfg.listeners || {};
-- 
2.39.2