问题描述：
   自己封装控件的一个属性，例如TextAtt，在这个属性下想要以属性展开的形式（就想Font带+号展现的形式）增加一个Name属性，怎么实现？

关键的问题是按照这种方法,WinForm下好用，WebForm下能显示出来，但是设计界面所设置的值保存不上呀

bool dataBindings;
        string BindSource;

        //增加绑定属性的扩展
        [TypeConverter(typeof(ExpandableObjectConverter))]
        public class BindAttriClass
        {
            public BindAttriClass()
            {
            }

            private string Ptext = "";
            private string Ptext1 = "";
            private string Ptext2 = "";
            //属性类中属性的属性,修改时通知父
            [NotifyParentProperty(true),]
            //描述增加的方法QMSDOSet：集合；QMDisplayField：显示的内容；QMValueField：存储的内容
            public string QMSDOSet
            {
                get { return Ptext; }
                set { Ptext = value; }
            }

            [NotifyParentProperty(true),]
            public string QMDisplayField
            {
                get { return Ptext1; }
                set { Ptext1 = value; }
            }

            [NotifyParentProperty(true),]
            public string QMValueField
            {
                get { return Ptext2; }
                set { Ptext2 = value; }
            }
        }

        public bool QMDataBindings
        {
            get { return dataBindings; }
            set { dataBindings = value; }
        }


        public string QMBindSource
        {
            get { return BindSource; }
            set { BindSource = value; }
        }

        public BindAttriClass qMBindAtts = new BindAttriClass();

        [PersistenceMode(PersistenceMode.InnerProperty), DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        //PersistenceMode.InnerProperty理解为，这个属性是在aspx中标记为嵌套标记
        //DesignerSerializationVisibility.Content,代码生成器产生对象内容的代码，而不是对象本身的代码。
        public BindAttriClass QMBindAtts
        {
            get { return qMBindAtts; }
            set
            {
                qMBindAtts = value;
            }
        }
    }