vb.net - data bound combobox not allowing tab away

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VB

I have a ComboBox that is data bound to a property of an object. The ComboBox contains a list of Enum values and descriptions which I have generated as follows:

Public Class Enumeration

#Region "Enumeration handling mothods"

    Public Shared Function GetList(ByVal Enumerator As Type) As Enumeration.List
        Dim items As New Enumeration.List
        Dim values() As Integer = System.Enum.GetValues(Enumerator)
        For Each enumItemId As Integer In values
            Dim enumItem As New Item(enumItemId, System.Enum.GetName(Enumerator, enumItemId))
            items.Add(enumItem)
        Next
        Return items
    End Function

    Public Class Item
        Private _iId As Integer
        Public ReadOnly Property Id() As Integer
            Get
                Return _iId
            End Get
        End Property

        Private _sDescription As String
        Public ReadOnly Property Description() As String
            Get
                Return _sDescription
            End Get
        End Property

        Public Sub New(ByVal EnumId As Integer, ByVal EnumDescription As String)
            _iId = EnumId
            _sDescription = EnumDescription
        End Sub

    End Class

    Public Class List
        Inherits List(Of Enumeration.Item)

        Default Public Shadows Property Item(ByVal index As Integer) As Item
            Get
                Return MyBase.Item(index)
            End Get
            Set(ByVal value As Item)
                MyBase.Item(index) = value
            End Set
        End Property

        Public Sub New()
            MyBase.New()
        End Sub

        Public Shadows Sub Add(ByVal EnumItem As Item)
            MyBase.Add(EnumItem)
        End Sub

    End Class

#End Region

End Class

and my Enum is defined as follows

Public Enum Statuses
        Unspecified = 0
        Active = 1
        OutOfService = 10
        Sold = 50
        Scrapped = 99
    End Enum

The

SelectedValue

property of the ComboBox binding is sent to the myOject.Status property

In the Form Load event

myBindingSource.DataSource = _oMyObject

statusComboBox.DataSource = Enumeration.GetList(GetType(MyObject.Statuses))

I can select any of the statues, but it will not let me leave the ComboBox. If I remove the binding then the comboBox operates as expected, except then the object property value is not updated.

Any help greatly appreciated.

Thanks