Anmation/Timer Question

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I'm trying to create an animation using the timer tick control, 3 picture
boxes and a form here's the code which isn't working, seemed to work in VB6,
but now I am using VBexpress, any suggestions?
Thanks,
Jerry

Public Class Form1
Dim nextpicture
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

End Sub

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Timer1.Tick
Select Case nextpicture
Case 1
PictureBox1 = PictureBox2
Case 2
PictureBox1 = PictureBox3
End Select
nextpicture = nextpicture + 1
If nextpicture = 3 Then
nextpicture = 1

End If
End Sub
End Class