Specifying explicitly if it relative to the page or to the margin.

Question

There is a problem when a part of an object exit the page bound if the pages' direction shuffled. This problem rise when the pages's direction shuffled again.
So I suggest if there is a way to specify explicitly if an object is relative to the page or to the margin exactly as if the object is anchored inside text frame.
When you try this file, it will be clear:
https://docs.google.com/leaf?id=0BysC4QT512vCOGRhY2I1MGEtNzJiNS00NjFkLWJlZjEtNjM4YmU2NzAzO GQ4&hl=en&authkey=CJuFpPwL

Answer 1

Never mind the InDesign file, only produce these steps:
At first create a file with three pages and make the inside margin more wide than out margin as in the above screenshot.
Then create two objects:
a black background extend to near spine.
a text frame for white title and body text.
Delete the page number 2.
Then you see that the black background exit out page bound (because it's relative to the margin before deleting).
Until now every thing is good.
Insert again a page before page 3
The black background now has different location than the original one. (Why) I will tell you.
Because the object was relative to the margin before deleting page 2 and become relative to the page after the deleting.