Anchoring Background Pages, Top/Bottom, Left/Right

[billgregg55]

I have a 77-page Visio file, and I need to change the background page on all 77 pages. The background page I want to apply contains only guides, mostly vertical but some horizontal.

The 77 foreground pages vary in height and width, and when I apply the new background page, I need it to anchor or align to the top-left corner of the foreground page, but it's aligning to the bottom-left corner instead--and I can't use it that way. How do I control the placement of the background page when it gets applied? I'm using Visio 2010.