This not really just a checkbox widget anymore it inherits from
FieldLayout and became something more in that direction.
Let's use a mixture of these things to make it a bit clearer.
See also comment in Ie81b84be288553343017c4aaf8691c4e266995f5
Change-Id: Iff1746a8e5e94b56eb6c27465405aaf6b74c2310
