AutoCAD .NET :: Command Not Starting In Debug

I am writing a program in vb.net.I have a command.

<CommandMethod("att2att")> _
    Public Sub att2att()
        Dim ed As Editor
        ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor
        ed.WriteMessage(String.Format("{0} commande: att2att, maintenant disponible...", System.Environment.NewLine))
        Dim start As New FileSelect
        start.ShowDialog()
    End Sub

In the debug mode, the att2att is not recognize.If I compile, netload and call the command, it works. Why is the command not recognize in debug mode?