WPF前进/后退按钮

Question

我想在我的应用程序中使用WPF（Visual Basic 2010 Express）中的后退和前进按钮。我有六个tabitems，这两个按钮将用于在tabitems之间导航。

我使用了以下代码，但它不起作用。我做错了什么？

Public ReadOnly Property CanGoForward As Boolean
    Get
        CanGoForward = True
    End Get
End Property

Private Sub forward_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles forward.Click
    TabIdentiPodatki.goforward()
End Sub

Private Sub TabIdentiPodatki_CanGoForwardChanged(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles forward.CanGoForwardChanged
    forward.IsEnabled = TabIdentiPodatki.cangoforward
End Sub