How to break page in my solution?

[as_9]

Hi, i made a very dynamic and complicated report. 
I try to make it simple here:

i have the bands:

detail1
detail2
detail3
and other uninteresting stuff.

Depending on database there can be different combinations of the print order of detailbands because of print when expression.

What I want: 
When detail1 is in the lower part of the page -> there should be a break over it, so detail 1 is printed on the next page.

For example the page is 200x500
I imagined something like this: "break" element in detail 1 has a print when expression like "if element.position.y >= 400". But i dont know how to get the element position on the page and i m not even sure if it is possible.

Has somebody an idea, how i can solve my problem?