What is the proper syntax for adding items to a listbox?

listbox.setnewitem = item

listbox.newitem.add(item)

listbox.items.item(item).register

listbox.items.add(item)

listbox.itemmenu.add(item)

Answer:
listbox.items.add(item)

Note: This Question is unanswered, help us to find answer for this one