public class ConverterSample : System.ComponentModel.StringConverter
   {
      public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
      {
         //true means show a combobox
         return true;
      }

      public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
      {
         return false;
      }


      public override TypeConverter.StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
      {
         return new StandardValuesCollection(new List<string>(){"Stack", "overflow", "rules");

  }