Sorry, I wasn't clear: Locking a TextMorph works fine. But I wanted to
lock the textmorph contained in ScrollableField. This didn't work. 

Greetings
Daria
> 
> You could try using a StringMorph.
> 
> But locking a TextMorph works for me.  Draggging a TextMorph out of
the
> supplies bin, selecting the red halo and then, "be locked" prevents me
> from
> further edits.
> 
> Not sure why that didn't work for you..