Apple Script for layer visibility in OmniGraffle Pro 4?
 

I'd like to be able to show/hide layers with actions. I know this can be done in OmniGraffle 5 but I'm using OmniGraffle Pro 4 (can't upgrade to 5 because I'm still on Tiger). Could this be done with an AppleScript? Unfortunately, I'm not very fluent in AppleScript; I tried copying and pasting from example scripts, but I can't get this to work. Any help? Example scripts that do work to turn on/off layer visibility?