diff --git a/gen/generator.py b/gen/generator.py
index 39dde64..67cc99b 100644
--- a/gen/generator.py
+++ b/gen/generator.py
@@ -449,8 +449,9 @@ class ZopeGenerator(Generator):
                 baseLabels = po.PoParser(appyPoFileName).parse().messages
             else:
                 baseLabels = appyLabels
-            poFile.update(baseLabels + self.labels.get(),
-                self.options.i18nClean, keepExistingOrder=False)
+            poFile.update(baseLabels + self.labels.get() + \
+                          potFile.getCustomMessages(), self.options.i18nClean,
+                          keepExistingOrder=False)
             poFile.generate()
         # Generate corresponding fields on the Translation class
         page = '1'
diff --git a/gen/po.py b/gen/po.py
index a1c0152..2d5bf03 100644
--- a/gen/po.py
+++ b/gen/po.py
@@ -276,6 +276,11 @@ class PoFile:
             res = '%s-%s-%s.po' % (self.applicationName, self.domain, language)
         return res
 
+    def getCustomMessages(self):
+        '''Returns, the list of messages from self.messages whose ID starts with
+           "custom_".'''
+        return [m for m in self.messages if m.id.startswith('custom_')]
+
 class PoParser:
     '''Allows to parse a i18n file. The result is produced in self.res as a
        PoFile instance.'''
diff --git a/gen/wrappers/__init__.py b/gen/wrappers/__init__.py
index c47b5d6..7579d49 100644
--- a/gen/wrappers/__init__.py
+++ b/gen/wrappers/__init__.py
@@ -570,7 +570,7 @@ class AbstractWrapper(object):
                layoutTarget=obj">:tool.pxLayoutedObject</x>
       </form>
       <script type="text/javascript"
-              if="confirmMsg">:'askConfirm(%s,%s,%s)' % \
+              if="confirmMsg">::'askConfirm(%s,%s,%s)' % \
              (q('script'), q('postConfirmedEditForm()'), q(confirmMsg))</script>
       <x>:tool.pxPageBottom</x>
      </x>''', template=pxTemplate, hook='content')