The button menu items on GTK menus honor the enabled state of the command....

app/menus/button_menu_item_model.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "app/menus/button_menu_item_model.h"
 
 #include "app/l10n_util.h"
 
 namespace menus {
 
@@ skipping 85 matching lines @@
 bool ButtonMenuItemModel::PartOfGroup(int index) const {
   return items_[index].part_of_group;
 }
 
 void ButtonMenuItemModel::ActivatedCommand(int command_id) {
   if (delegate_)
     delegate_->ExecuteCommand(command_id);
 }
 
 bool ButtonMenuItemModel::IsEnabledAt(int index) const {
+  return IsCommandIdEnabled(items_[index].command_id);
+}
+
+bool ButtonMenuItemModel::IsCommandIdEnabled(int command_id) const {
   if (delegate_)
-    return delegate_->IsCommandIdEnabled(items_[index].command_id);
+    return delegate_->IsCommandIdEnabled(command_id);
   return true;
 }
 
 }  // namespace menus