Slayer talent not showing up for Unchained Rogue?

[Azhrei]

Hey everyone. Can someone tell me if they think this is correct...?

I'm playing with my build again and I've got 5 levels of unchained rogue selected so far. But when I look at the rogue talents available to me, the "Trapfinding" talent from the Slayer list doesn't show up. (The reason I need that is I've taken the Shadow Walker archetype from Blood of Shadows and it replaces trapfinding with something else. Sigh; I guess I really just need gestalt characters! )

I might just be missing something; a lot of the expanded resources from Paizo are new to me and I'm just picking them up. (But I have to say, my zen archer/shadow walker build is turning out pretty good. )