Applescript action for "completed" items

[Brian Campbell]

I'm new to OmniOutliner, this list and pretty much clueless about  
AppleScript.  However, i'm wondering... Is it possible to create a  
script that applies a style (say changing the color of a row and it's  
children) once the checkbox for that row has been selected?  An  
alternative that I'd even prefer is to create a dropdown list, and  
apply different styles to a row based on the selection from that list...

Cheers!
Brian