参考:
    public void insertToc()
    {
        Dispatch range = Dispatch.get(this.selection, RANGE).toDispatch();
        Dispatch fields = Dispatch.call(this.selection, FIELDS).toDispatch();
        
        Dispatch.call(fields,
                      ADD,
                      range,
                      new Variant(-1),
                      new Variant(TOC),
                      new Variant(true));
    }