Function: Prints the appropriate response to a menu quick search.

Function: Register nav menu meta boxes and advanced menu items.

Function: Limit the amount of meta boxes to pages, posts, links, and categories for first time users.

Function: Creates meta boxes for any post type menu item.

Function: Creates meta boxes for any taxonomy menu item.

Function: Check whether to disable the Menu Locations meta box submit button and inputs.

Function: Displays a meta box for the custom links menu item.

Function: Displays a meta box for a post type menu item.

Function: Displays a meta box for a taxonomy menu item.