I'm trying to limit the amount of characters that can be entered into a TextareaField in the admin area (eg. 400 char limit) but I can't seem to find any info on this on the forum or documentation.
I can limit a simple TextField using
$f->addFieldToTab("Root.Content.Main", new TextField('Intro', 'Intro', '', 400), 'Content');
But can't find anything for TextareaField.
Any help would be appreciated.