I recently worked on a project that involved an App UI.
While working on it I had an idea on how to animate a selector going through the tiles and highlighting them.

The The Selector Null is moved with the magic of xpresso to a specific clone. All keyframes are "step" keyframes and the delay comes from the delay effector set to "blend". The pop out Animation is triggered through a plain effector (move in z and scale) and handled with a Filed linked to a Selector Null.

This was more a proof of concept. The animation wasn’t needed in the end so I did not develop it further. Someone might find this useful.

The method for this came from this cineversity tutorial by Donovan Keith.

Download .c4d file