protected override ConfigurationElement CreateNewElement()
        {
            var elm = new ControlConfigElement();

            elm.ControlName = $"Control{Count + 1}";
            return(elm);
        }
        protected override object GetElementKey(ConfigurationElement element)
        {
            ControlConfigElement elm = element as ControlConfigElement;

            if (null == elm)
            {
                return(null);
            }
            return(elm.ControlName);
        }