linebreak in tabular

[Markus Mohr]

Hi!

Probably stupid question: I'm using 1.1.6fix2 with Debian and I am
trying to make a linebreak in a table. CF or ctrl-CR don't work. I know
from the past and from comments on this list, that there must be a knob
for 'allow linebreaks', but where is it?
Its not in Layout->Tabular and not in Edit->Tabular.

puzzled 
marksu