Adding property to specific armors

[Corren28]

Hello, I didn't see anything pertaining to this when I searched through the forums so if this is a repost I apologize.

One of my players recently received a suit of Shadow Mistmail from an encounter and is trying to add it to her character in Hero Lab. I can add a suit of Mistmail to her character, and I can add a +1 chain shirt to her character with the shadow property. What I cannot seem to do is add the Mistmail to her character with the shadow property on the Mistmail.

Could anyone tell me what I'm doing wrong or what I'm missing?

Thanks!