How to turn off spellchecking for a SheetWindow?

I have a couple of SheetWindows to allow the user to type in a list of domains. Spell checking these makes no sense, so how can I turn it off? The SheetWindow is insrantiated and appears to have no AllowSpellChecking property.

A sheet window is just a window, I assume you have a TextEdit (TextAea or Textfield) in it and this in turn has a AllowSpellChecking property.

Yes yes of course you’re right! It’s too long since I set these up (actually, turned it off in the IDE).