The Menu control has an ItemCount property that returns the number of items

[adakist]

The Menu control has an ItemCount property that returns the number of items in the control, as well as a Caption property that sets the menu's title. The index of the selected item is reported back to the program from within the control's Click event handler.

[brumbino]

This event is triggered when a menu option is selected. Because some menus might not lead to submenus, the Menu control recognizes the Select event, which is triggered only when the user clicks a Menu control without a submenu.