Macro Won't Update Pivots

I have a macro that is supposed to update 3 pivot tables with the change to just the first one but it doesn't work. Can anyone help?

Here is my code but nothing happens when I change the first pt (C & S). It doesn't update the other 3 tables.

Private Sub Worksheet_Calculate()
Dim PF1 As PivotField
Dim PF2 As PivotField
Dim PF3 As PivotField
Dim PF4 As PivotField
Dim x As String
Application.EnableEvents = False
Application.ScreenUpdating = False
Set PF1 = ActiveSheet.PivotTables("PivotTable4").PageFields("State")
Set PF2 = ActiveSheet.PivotTables("PivotTable3").PageFields("State")
Set PF3 = ActiveSheet.PivotTables("PivotTable2").PageFields("State")
Set PF4 = ActiveSheet.PivotTables("PivotTable1").PageFields("State")
x = PF1.CurrentPage
PF2.CurrentPage = x
PF3.CurrentPage = x
PF4.CurrentPage = x
Application.ScreenUpdating = True
Application.EnableEvents = True
End Sub

Pivot Table 4 = C & S this is one I want to make the change to
Pivot Table 3 = Sales Pivot
Pivot Table 2 = 2005 Pivot
Pivot Table 1 = SMG Pivot