Unity 4.6 Beta Controller Menu Button Movement

Hello,

I am wondering how to create a common form of menu movement with the new UI tools in Unity 4.6 Beta. With Scroll Rect, you can easily make a series of buttons that move with mouse drag, but I am curious how to make it so that these buttons will automatically adjust for controller input. So when the controller moves down to a button below those that are currently visible, they will move up automatically to show those buttons. As an example, this can be seen in the PS4 menu at the 1:00 mark of this video:

https://www.youtube.com/watch?v=uaLE6YbD6xo&t=1m

Where when the controller input moves down, after a certain spot, all of the buttons will animate upwards, revealing new buttons that were previously hidden out of screen, and the buttons that were animated upwards are hidden by a mask. How can this effect (or something similar) be achieved for vertical and horizontal buttons within a Scroll Rect? Thanks a lot!