The Apple Human Interface guidelines strongly recommend
against using a popup menu to display more than 256 items. If you
need to display that many items, it is better to use a scrolling
list, a treeview or a hierarchical menu. The OSControl Xtra
provides an OSmenu member which you can use to create up to four
hierarchical levels. With as few as 16 items per level, you can
display over 65,000 items.