How to manage two editable checkboxes in ALV class

Hi all,

I need to make two checkboxes fields appear only in some rows and I found this link:

alv-one-cell-as-checkbox-based-on-some-conditions

but it's not completely what I need, because I have to make the second checkbox editable only when the first one has been flagged, so it would be more useful a class alv.

How can I solve my problem?

Thanks,

Francesco