Reports :: Hiding A Field In Page Header Based On A Variable

I have a report where I number pages based on the Store (muliple stores in report but page numbering resets when Store changes) I do this by manipulating the page number field on the report by code in the report sections to reset it and to increment it.

Code:

Private Sub GroupHeader0_Format(Cancel As Integer, FormatCount As Integer)
Me!PageNum = 0
End Sub
Private Sub PageFooter_Format(Cancel As Integer, FormatCount As Integer)
Me!PageNum = Me!PageNum + 1
End Sub
Private Sub ReportHeader_Format(Cancel As Integer, FormatCount As Integer)
Me!PageNum = 0
End Sub

The report has a Page Header with various fields and labels and that's been fine however I've had a request to hide a field on subsequent pages (i.e. print it on the 1st page of each store then hide it).

So I added the following code to various sections, but can't get it to work correctly. The fields (label and text box) appear on Page 1 for the first store then get hidden but never return even though when I step through the code it is functioning 'correctly'. The GroupHeader code is performed but the fields don't get displayed on the report. I think is isn't re-painting that section but adding code to the Paint event does nothing, and in fact doesn't actually get run, so not sure when that event is triggered.

Code:

Private Sub GroupHeader0_Format(Cancel As Integer, FormatCount As Integer)
Me!PageNum = 0
lblMemberNo.Visible = True
MemberNo.Visible = True

[Code] ....