strange problem setting submenu on top level menu item

FROM : Martin Redington
DATE : Wed Apr 04 17:51:24 2007

I have a top level menu item in the main menu defined in my nib 
called "Cameras". This has a submenu, but there are no items in that 
menu.

When a camera is opened, I generate a new NSMenu for that camera. 
With only one camera, I want that menu to become the sub menu of my 
Camera menu, so that I end up with

Edit  Camera  Window
      Settings1
      Settings2
      Settings3

However, when I try the following:

    id <NSMenuItem> cameraMenu = [[NApp mainMenu] itemWithTag:1];
    NSMenu *settingsMenuForCamera = [self menuForCamera];
    [cameraMenu setSubmenu:settingsMenuForCamera];

I get

... Edit Camera SettingsMenu Window ...
                Settings1
                Settings2
                Settings3

The Camera menu item is correctly tagged, and is being retrieved ok.

    [[NSApp mainMenu] setSubmenu:[settingsMenuForCamera 
forItem:cameraMenu];

gives me the same result.