Pop Up Calendar for entier workbook

[Klee]

I have added a pop up Calendar to a spreadsheet. I now have added a couple of
dozen new worsheets and I need to have the calendar available in the same
cells in every worksheet. Can someone tell me how to tell the macro to apply
to all pages in the workbook?

I somehow managed to do this in another spreadsheet so I know it is possible
but I can't remember what I did.

Thanks