Problems with Many-to-many tables, Dapper and Odbc

I'm working with a Progress Database, with ODBC connection and Dapper, but i have some problems with many-to-many tables.

My tables:

User --- UserScreen(Many to many table) --- Screen

My ModelClasses

public class User : AttribClass
{
/// <summary>
/// Primary Key (ID)
/// </summary>
[Key]
public int Id { get; set; }

/// <summary>
/// AdLogin
/// </summary>
public String Login { get; set; }

/// <summary>
/// Ad Full Name
/// </summary>
public String UserName { get; set; }
}

public class Screen : AttribClass
{
/// <summary>
/// Primary key (ID)
/// </summary>
[Key]
public int Id { get; set; }

/// <summary>
/// ScreenName
/// </summary>
public String ScreenName { get; set; }

/// <summary>
/// Screen Description
/// </summary>
public String Description { get; set; }
}


And finnaly, my code:

public List<Screen> ReturnScreenByUser(int idUser)
{
var connection = DapperDbExtension.GetContext();

var sql = @"SELECT * from User where Id = ?
SELECT * FROM Screen WHERE ID IN
(SELECT screen_id FROM User_Screen WHERE user_Id = ?)";

using (connection)
{
var mapped = connection.QueryMultiple(sql)
.Map<Screen, User, int>(
screen => screen.Id,
user => iduser,
(screen, adusers) => { screen.Users = users; }
);

}

//Just to test
//return new List<Screen>();
}


But with QueryMultiple doesn't work.

It's possible that i'm doing something wrong?

I need a model Class for the Many-to-may table?

Thank's-a-lot

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