diff --git a/orun/extjs/base.py b/orun/extjs/base.py
index 6b7a050..086942f 100644
--- a/orun/extjs/base.py
+++ b/orun/extjs/base.py
@@ -58,4 +58,4 @@ class Component(js.JsObject):
     
     def __str__(self):
         s = json.dumps(self._js, default=js._encoder)
-        return re.sub(r'("handler":\s+)("([^"]+)")', r'\1\3', s)
+        return re.sub(r'(":\s+)("(function[^"]+)")', r'\1\3', s)