public void setItemIndex(NativeMenuItem item, int index) { return; }
public NativeMenuItem removeItem(NativeMenuItem item) { return item; }
public int getItemIndex(NativeMenuItem item) { return 0; }
public bool containsItem(NativeMenuItem item) { return false; }
public NativeMenuItem addItemAt(NativeMenuItem item, int index) { return item; }
public NativeMenuItem addItem(NativeMenuItem item) { return item; }