Move to a specific field - Control App

Hi,
i have a control app and i would like to move from a field (A) to another specific field based on the value entered in the field A.
Hou to to do this ?
Gianpaolo

I think you can do it. with the macro: sc_set_focus(‘Field’)

But what kind of event on the field A ?

create a Ajax event Onchange for field A, in this event set the macro: sc_set_focus(“B”);