How to print an element in a group header just once

[brotelle]

 Hello,

I am using Jasper Report and I have an issue that I can't manage to figure out.

I have a group header that has to be printed on each pages, and is using a group expression.

The thing  I want to do is, when my group expression changes, all the elements of the group header have to be printed, but if the details is overflowing on another page, then the group header has to be printed again but without some elements. I did manage to print the group header on each page using the "reprint header" option, but it's always with all its elements...

I don't know if I made myself clear...

Can anyone help me ?

 

Thanks a lot !