In my previous post, “Hidden SharePoint Lists, Fields, and Other Advanced List Settings”, I demonstrated how we can develop a custom application page to easily expose and modify list and field settings. But once the custom application page has been created, how do we expose it to our users? Ideally we would create links to our Application Pages by adding new menu item entries to the SharePoint Site Settings and Site Actions menus. Fortunately, SharePoint allows us to do just that via Features and the CustomActionGroup and CustomAction elements.
The CustomAction element refers to the actual link or menu item.