[DotNetDevelopment] Custom Control with Data Type property

[GotDotNetNow]

I'm building a custom user control.  One of the properties  must allow
the end user to select the numeric data type such as int, short, long,
double....  I'm having a problem figuring out what to use as a
internal property type, so that when the user selects the DataType
option in the property box it will give them a drop down list of all
the numeric types.

I've tried a few variances... This one below, when compiled display
the DataType property as grayed out.  It won't allow me to select or
enter a value.

        private System.ValueType _DataType;

        public System.ValueType DataType
        {

            get { return _DataType; }
            set
            {

                _DataType = value;
            }
        }

Any help is appreciated.
Thanks!