What version(s) of WoW are you using?

Retail

What problem are you experiencing that led to you asking for this feature?

There seems to be no way to show the upgrade track icon,
Workaround is to group them by the Upgrade track, but i don't like it much

What solution would you like?

Ability to add the upgrade track as the icon corner.

Any alternatives you can think of?

Maybe there is an addon that will work with it already but couldn't find anything

Anything else?

No response