Adding Gear to my Follower?

When dealing with my gear I see a very convenient set of both items stats so I can decide if it’s better or not. Is there some trick to see that same kind of display when you have your follower’s gear set open?

If your Follower and your Inventory are open, you will see Stat change numbers displayed over your Follower’s gear when you hover over the item, if the Follower can equip it and if it is in Inventory rather than equipped.
Ex: If you have a DH with a Scoundrel, it will show stats for bows and crossbows in your inventory but not 1H crossbows because those are DH only.