Advanced thumbnail scroller?

Advanced thumbnail scroller ?

I’m trying to produce a thumbnail scroller as shown here.

This example seems to work better than most tutorials I’ve found, which just scroll the thumbnails in the opposite direction of the mouse movement and then you have to bring the mouse to the center of the mc to stop the movement and click on the thumbnail.

The example shown seems to stop when you roll over the thumbnail.

I bought the component that is shown in the example in a hope to work out how it was achieved, I have since found out that is not possible - I need to add other functionailty to the example shown.

Does anyone know of any good tutorials on producing an expandable scroller.

Thanks in advance