2 part question WDP 16:

Some objects, including text, will automatically stick to the bottom of a page. When the page is lengthened or shortened by dragging the page boundary the object remains relative to the page. The 'Auto-Fit to Page' section didn't appear to give any options that were applicable (but it did make my eyebrows raise when everything shrank, ctrl z ctrl z).

Part 1 - How does one make an object 'stick' to the bottom of the page (footer)?
Part 2 - Why do some objects do this automatically and some don't (is it because I create some objects in a hidden zone and others I drag there later)?