Change xy position of an object using buttons

Hello all! I started using Flash again after a “brief” hiatus (the last time I used it, Flash was on it’s MX version :puzzle:)
See, I am trying to create an animation in which I can move across the stage a simple object (a circle, a square or a star, for example) using buttons (left, right, up and down)
This was fairly simple using AS 1, even when I was no expert. The thing is that those simple ways are no longer working with AS 3.
I spent a few hours doing some research until I found this nice tutorial on this same site:

I followed the tutorial, and all was working nicely, but when I attempted to do the animation from scratch, it simply didn’t work ;(
I even used the same names for all the objects and instances, but still nothiing. I know that this tutorial uses AS 1, I’d just like to find a way to do it in AS 3 (or maybe AS 2)
I’m open to sugestions :stuck_out_tongue:

Thank you all in advance.