[TYPO3-templavoila] FCE: Want user to chose div-layerclass using dropdown - Documentation on 'selector box' ?

[Thomas Russel]

Hello,

I want to create an FCE with a selector box (drop down menu) where the 
user can chose from 3 different classes.
Depending on their chosing, the div gets a different class.

I guess I have to use the Editing Type "selector box" but I can't find 
any documentation/tutorials how to configure them :-/

Can anyone help ?