Conditional Compilation Problem

I'm trying to create a Universal App and I'm following this example http://blogs.msdn.com/b/bingdevcenter/archive/2014/06/24/using-maps-in-universal-apps.aspx

I've run the MapView.cs file through a VB converter but the result fails on  Me.Children.Add(_map). as it's undeclared or inaccessible  The Code is ..

#If WINDOWS_PHONE_APP Then
Imports Windows.UI.Xaml.Controls.Maps
Imports Windows.UI.Xaml.Media
Imports Windows.UI.Xaml.Shapes
Imports Windows.UI.Xaml
#Elif WINDOWS_APP Then
Imports Bing.Maps
#End If

Namespace App3
    Public Class MapView
        Inherits Grid
#If WINDOWS_APP Then
		Private _map As Map
		#Elif WINDOWS_PHONE_APP Then
		Private _map As MapControl
#End If

        Public Sub New()
#If WINDOWS_APP Then
			Private _map = New Map()
			#Elif WINDOWS_PHONE_APP Then
			Private _map = New MapControl()
#End If

            Me.Children.Add(_map)
        End Sub
    End Class
End Namespace

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