NumericUpDown vertical textalignment

I'm trying to vertically centre the text in a NumericUpDown control. I'm fairly sure there's no property i can change, but is there an API i could use? Does anyone have any experience with this?
I tried this, and it didn't work...

Code:

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Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" ( _
    ByVal hwnd As IntPtr, _
    ByVal wMsg As Integer, _
    ByVal wParam As Integer, _
    ByVal lParam As RECT _
) As Integer

    Private Structure RECT
        Dim Left As Integer
        Dim Top As Integer
        Dim Right As Integer
        Dim Bottom As Integer
    End Structure

    Private Const EM_SETRECT As Integer = &HB3
    Private Const EM_GETRECT As Integer = &HB2

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Code:

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Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For Each nud As NumericUpDown In Me.Controls.OfType(Of NumericUpDown)()
            Dim tb As TextBox = DirectCast(nud.Controls(1), TextBox)
            Dim myRect As New RECT
            Dim sf As New SizeF
            sf = tb.CreateGraphics.MeasureString("1", tb.Font)
            'set rectangle to match text height and center it
            Dim textHeight As Integer = CInt(sf.Height)
            'Dim boxHeight As Integer = tb.ClientSize.Height
            myRect.Left = 0
            myRect.Right = tb.ClientSize.Width
            myRect.Top = 2
            myRect.Bottom = myRect.Top + textHeight
            SendMessage(tb.Handle, EM_SETRECT, 0, myRect)
        Next
    End Sub

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Anyone know how to do this?