Problema binding datagridview con entita personalizzata

Public Class Persona
    Inherits RM_Base

    Private m_PersonaID As New RM_Item("PersonaID", GetType(Integer))
    Public Property PersonaID() As RM_Item
        Get
            Return m_PersonaID
        End Get
        Set(ByVal value As RM_Item)
            m_PersonaID = value
        End Set
    End Property

    Private m_PersonaNome As New RM_Item("PersonaNome", GetType(String))
    Public Property PersonaNome() As RM_Item
        Get
            Return m_PersonaNome
        End Get
        Set(ByVal value As RM_Item)
            m_PersonaNome = value
        End Set
    End Property

    Public Sub New()

    End Sub
End Class


<Serializable()> _
Public Class RM_Item

    Private m_strNome As String
    Private _p1 As String
    Private _type As Type


    Public Property Nome() As String
        Get
            Return m_strNome
        End Get
        Set(ByVal value As String)
            m_strNome = value
        End Set
    End Property

    Private objValore As Object
    Public Property Valore() As Object
        Get
            Return objValore
        End Get
        Set(ByVal value As Object)
            objValore = value
        End Set
    End Property

End Class