Formatting the bottom of a report

Hi

I have a report ,where the boxes i added will not align at the bottom of a page.

I have grouped the report in 3 groups,

suppressing the details line , I am using GF3 as the details line.

I have a box, that covers G1, another for G2 and another to cover each record on G3.

However I am struggling to get them to align at the bottom of the page, when G1 runs to the next page. (see image)

Using Crystal Reports 2008

Any suggestions would be greatly appreciated.

Thanks

Rachael