Now I want to change the Edit Color Providers property to true, but couldn't find a way to do this. I used EMF EPackage Registry View to find the right command, but it seems to me that there are not all properties contained.
I mean this (in case we don't mean the same thing):
It's the genmodel which is generated by Eugenia out of my emf file.
The codeline for the decoration property I posted before definitely works for me. I use this in my own editor - if you need it, I can share it with you.
Hmm, that's indeed odd. Your EpackageRegistry looks different then mine and I have no bottom half listing for my genmodel, but when I click on GenDecoration e.g. as shown in my screenshots. Which plugin provides the EPackage Registry View?