Move focus for usercontrol on enter key down

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VB

WPF

How to move focus from one to another user control when enter is keydown like with tab?
User control contains textbox and label, event is declared for grid...
This code work for Controls but no work for user control....
Sorry for my bad English...

Private Sub drzac_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Input.KeyEventArgs)
       Dim tb As New Control
       tb = e.Source
       If e.Key = Key.Enter Then
           tb.MoveFocus(New TraversalRequest(FocusNavigationDirection.Next))
       End If
   End Sub