Scrubbing the timeline : actual view ?

I absolutely would love this feature.

I'm currently working on my first Storyline project, and having come from a Flash and Director background, not to mention Premiere, Logic, Final Cut Pro, etc., I'm surprised that Storyline doesn't work this way. Logically, where the current time indicator is located in the timeline should show the appropriate things at that moment in time in the preview window like this:

http://www.mediacollege.com/adobe/premiere/pro/workspace/current-time-indicator.html

It's nearly essential to have this functionality to make sure things happen when I want them to happen. The lack of this ability is going to add serious production time and frustration while I build this course. I mean, for a long slide with several elements, having to show and hide them like Pierre states, and then previewing the slide to see if it all works as I intend it to every time I make a slight tweak is extremely counter-productive and time consuming.

PLEASE implement this scrubbing feature, or play from current time indicator type of thing with Preview!

I'd like to think you folks are already working on it, but haven't worked the kinks out yet.

Thanks,

Kevin