SSRS 2008R2, Unable to Reset Page Numbers

I am using SSRS 2008R2, and can see the BreakLocation, ResetPageNumber, and PageName properties, but am unable to get the reset working.  Currently, my dataset has no groups, only detail records, but adding a group on the key field and setting the properties made no difference.  The textbox in the footer has this expression in it:

=Globals!PageName & ": Page " & Globals!PageNumber & " of " & Globals!TotalPages & " pages"

When the report runs, I notice that the PageName is always empty.  Setting the InitialPageName made no difference.  I have read these:

http://blogs.msdn.com/b/robertbruckner/archive/2010/04/25/report-design-reset-page-number-on-group.aspx

Understanding Pagination in Reporting Services: http://msdn.microsoft.com/en-us/library/dd255278.aspx