Hello,
Thank you for additional details.
Currently it is not possible to set a color for a stereotype name, if stereotype assigned to attribute or operation. We have recorded such issue to our database, however the fix timeframe is not set yet.
Also, even if this would be possible, we do not support different colors for different owned elements displayed on owning shape (so, basically you can change color for all operations, but no for each operation separately).
Please do not hesitate to contact us if you have more questions or problems. However, we highly recommend contacting us on our official tickets system
http://knowledgebase.nomagic.com , as it allows to follow through with the tickets easier.
Sincerely,
No Magic, Inc. Customer Support