CategoryAttribute[]下面如何建立子元素???

Question

[CategoryAttribute("标签专题图"),DescriptionAttribute("aaa")]
        public FontDialog fontD1
        {
            get
            {
                return fontD;
            }
            set
            {
                fontD = value;
            }
        }想在"标签专题图"下面在建立一个子元素?该怎么实现呢?