Binding a DetailsView to a "sub" Object of a Business Object

How do i bind a DetailsView to a Business Object's sub object's properties? I'm not sure that question means much yet so let me explain:

I have a "Customer" object which contains properties etc related to my customers (first name, last name etc)

       Public Property FirstName() As String
            Get
                Return _firstName.Trim()
            End Get
            Set(ByVal value As String)
                If value IsNot Nothing Then
                    _firstName = value.Trim()
                End If
            End Set
        End Property

        Public Property Lastname() As String
            Get
                Return _lastName.Trim()
            End Get
            Set(ByVal value As String)
                If value IsNot Nothing Then
                    _lastName = value.Trim()
                End If
            End Set
        End Property

The mailing address of the Customer object is actually a "pointer" to another object

        Public Property MailAddress() As MailAddress
            Get
                Return _mailaddress
            End Get
            Set(ByVal value As MailAddress)
                If value IsNot Nothing Then
                    _mailaddress = value
                End If
            End Set
        End Property

The MailAddress Object contains the properties for a mailing address e.g.:

        Public Property Address1() As String
            Get
                Return _address1.Trim()
            End Get
            Set(ByVal value As String)
                If value IsNot Nothing Then
                    _address1 = value.Trim()
                End If
            End Set
        End Property

        Public Property Address2() As String
            Get
                Return _address2.Trim()
            End Get
            Set(ByVal value As String)
                If value IsNot Nothing Then
                    _address2 = value.Trim()
                End If
            End Set
        End Property

So to set properties of the customer object I can do this:

                customer.FirstName =
                customer.Lastname =
                customer.MailAddress.Address1 =
                customer.MailAddress.Address2 =

However I cant get at the MailAddress properties from within the DetailsView. I thought I could do this:

<asp:BoundField DataField="MailAddress.Address1" HeaderText="Address 1" />

However that doesnt work and if try and just use the VS wizard to bind the DetailsView to the Business Object only the String fields are generated in the DetailsView. The MailAddress sub object is completely ignored.

How do I tackle this? Do I have to create separate address properties in the customer object that just act as pointers to the properties in the address object.

Thanks for your help