public void AddItem(string itemName, Vector2?materialOffset, ItemSelectedCallback callback, List <object> data) {
public static extern bool igListBox2(string label, ref int currentItem, ItemSelectedCallback items_getter, IntPtr data, int items_count, int height_in_items);
public static extern bool igListBox2(string label, ref int currentItem, ItemSelectedCallback items_getter, IntPtr data, int items_count, int height_in_items);