Pro vs Lite

I just recently updated a project from Lite to Pro. One item users commented on was that previously (on lite) when they moved their mouse around(hover) the calendar it would highlight the open-time slot, now it does not. I did notice this. Is this a property setting I am missing? Also, is it possible to get a custom tool tip to display when hovering over an open time slot? when a user hovers over a timeslot, I want to display "Not Available" or perhaps the specific time.