weird display behaviour for enums

underscores in EnumNames trigger weird display behaviour of enums in Optimization.

/// <summary>
///  build robot
///  add symbol
///  select optimization
///  select the possibilities for Message
///  See the weird display behaviour
///  </summary>

using System; 
using cAlgo.API; 

namespace cAlgo.Robots
{
    [Robot(AccessRights = AccessRights.None)]
    public class _TEST_1 : Robot
    {
        [Parameter(DefaultValue = Tests.One)]
        public Tests Message { get; set; }
        public enum Tests { One, One_Half, Two, Two_Half }
    }
}