Enum with 0 value not shown on Example

public class MyOption
{
[Option('t', "type", Required = true, HelpText = "My entity")]
public EntityType MyEntityType { get; set; }
public enum MyEntityType
{
X0, // Example for X0 is empty. If change this line to X0 =1, everything is ok
X1,
X2
}

[Usage(ApplicationAlias = "...")]
public static IEnumerable Examples
{
get
{
foreach (EntityType entityType in Enum.GetValues(typeof(EntityType)))
{
yield return new Example(entityType.ToString(), new MyOption { MyEntityType = entityType});
}
}
}
}