"Upgraded Unit" condition

Im looking for the condition used to check what Unit X has been upgraded into.

Like:

Event:
A unit finishes an upgrade.

Condition:
Unit-type of (Upgraded Unit) equal to Keep.

Event:
Do stuff.

Or maybe when you upgrade to the next tier, that doesn't count as an upgrade, does it count as a construction?

That trigger works, however i don't see an upgraded unit as a condition. Use triggering unit instead and it will work fine.

You're after Researching Unit. Triggering unit works as well.