How to get Feedback Master Try Again Layer to Auto-Hide

I'd like a Try Again message to flash on the screen for 2 seconds when a user gets a question wrong. I've adjusted the timeline on the Feedback Slide Master and the specific Try Again layout but it won't work.

Before I got some great advice about adding an off-screen object on the FB Slide Master and setting a trigger to jump to next slide when the object's timeline ends. That works great! But when I tried the same thing but changing to trigger to 'hide layer', it doesn't work.

Now the try again layer has an auto-created Continue button with a hide layer trigger given to it. Is there some way with variables that I could set it to 'clicked' when the timeline ends?

Why am I trying to do this? Because I want to avoid having students make unnecessary clicks. It's tedious and slows things down. I think the submit button is often unnecessary as well if you're dealing with a simple slide with 2 buttons. I want the interface to be smoother like a video game would be. 

Thanks for any help.