Numeric Entry and Enter Keys and Triggering Layers more than once

I have a numeric entry box on a slide. It works. However, it only "takes" the answer when I click somewhere out of the box, not when I hit the enter key. I have other slides where hitting the enter key works, and I remember there was something I had to do to make that work, but it's been so long I can't remember how I did it, and I can't find the answer on the google. Help? I think I remember it was a simple fix but I'm missing it somehow. I've compared everything I can think of between the ones that work and the ones that don't, but I'm not seeing the difference.