This Electronics submenu is not part of Xubuntu by default. You've probably installed an extra package that provides a .menu in /etc/xdg/menus/applications-merged/ (they will be automatically included in the panel menu).
But indeed, it seems that alacarte doesn't support menu merging, that's why it doesn't appear in the editor.
This Electronics submenu is not part of Xubuntu by default. You've probably installed an extra package that provides a .menu in /etc/xdg/ menus/applicati ons-merged/ (they will be automatically included in the panel menu).
But indeed, it seems that alacarte doesn't support menu merging, that's why it doesn't appear in the editor.