formating a report

[ajp18]

Hi,

I am trying to print the supreort till another subreport is finish.
I was wondering if there is a wait and release event or something similar that would enable me to control what and when data is printed on the rpeort.

detail a
detail b <subreport 1 and subreport 2>

I want both subreports to have same length even though they may be writing different numbers of records.

Thanks