Petapoco - Can't auto join

I have an object call Country and another call CounytryRegions as express below

[TableName("Countries"),
PrimaryKey("Code", autoIncrement = false)]
public class Country
{
    public Country()
    {
        this.CountryRegions = new List<CountryRegion>();
    }

    public string Code { get; set; }
    public string Name { get; set; }

    [Foliaco.DataAccess.ResultColumn()]
    public List<CountryRegion> CountryRegions { get; set; }

}

[TableName("CountryRegions"),
PrimaryKey("Code", autoIncrement = false)]
public class CountryRegion 
{
    public CountryRegion()
    {
        this.Country = new Country();
    }

    public string Code { get; set; }
    public string Name { get; set; }

    public string CountryCode { get; set; }

    [Foliaco.DataAccess.ResultColumn()]
    public Country Country { get; set; }

}

If I execute the sql below

 Country country = this.DB.Fetch<Country,CountryRegion>("select * from dbo.countries c join dbo.countryregions cr on c.Code = cr.CountryCode where c.Code = @0","US").FirstOrDefault();

I'm expecting to get on the CountryRegions property of the Country class all the associated records to that country, but instead I getting the get following Error

Can't auto join CountryRegion

Thanks for the help

I think I found the problem according with their documentation I need to crated a Realtor Class to load the list refer to section One to Many on the Petapoco Documentation, I've also found this helper class OneTOMany that makes the Realtor class more generic