how gnome panel handle submenu and app's show/non-show information?

["Liu, Raymond" <raymond liu intel com>]

Hi

My system is ubuntu 8.04
I check the /etc/xdg/menus/applications.menu, I can see that not all the submenu is actually show in the gnome-panel
And also not all the app is show in each submenu or category.
I can see that in UI interface, I can config which item is show and which is not.
But where does these show/hide information stores? And I don't see in the desktop file spec or menu spec about this. Where can I find documents on it?

Thanks.

Best Regards,
Raymond Liu