Managing the size of the box control manually in a screen

Hi,

I have some Box control (basically just a frame around some fields with a title) within my screen that I created with the screen painter.

Usually when there is many fields in the box and you set ACTIVE = '0' in the loop at screen for some of these fields, the box size reduce automatically... so cute, so nice !

I'm using a step loop control within the box and the system does not reduce or enlarge the box automatically, so I guess I have to do it manually but is it technically possible ?

I cannot find any field of the structure SCREEN to control such parameters...

thanks,

Dany