Default Shortcut/image press

Hey everyone! I apologize in advance if this was asked already, but nothing came up through search.

I've created a shortcut dock with Zooper and can't seem to figure out how to make the images/icons (they're static images) look like they've been pressed when pressed--if that makes sense. Is this just not possible with Zooper?

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It's Soundprizm, dammit!
The other thing I do.