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IItemCollection<DropDownItem>, IItemList<DropDownItem>, Iterable<DropDownItem>IDropDown control.This interface preserves the DropDownItem generic type for IItemList APIs, so drop-down items can be accessed and modified without losing their public item type.
IDropDown dropDown = worksheet.getControls().addDropDown(20, 20, 120, 20);
IDropDownItemList items = dropDown.getItems();
items.add(new DropDownItem("Pending"));
items.add(new DropDownItem("Approved"));
add, clear, contains, getCount, removeget, indexOf, insert, removeAt, setforEach, iterator, spliterator