Drag and Drop to Reveal Layer

I have an interaction that I am trying to create. The user has three items that I'd like them to drag to a "shelf" to learn more. When the user drops the item onto the shelf, I want it to reveal a new layer so that they can get the info. 

Seems simple enough - I'm just not getting it to work right (meaning that I've been working too late and almost brain dead). 

Any thoughts?

Tim

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