linebreak in editable cell of simplelist

[Jens Wilke <jens wilke org>]

Hi,

i've got an editable text cell in a simplelist, which shows multiline text.
When it gets the cursor, the linebreaks are shown as squares and all the text 
is in one line.

How can i solve this?
How is it possible to insert linebreaks in these entrys? (any shortcut?)

Tx, Jens