Draggable action list size

[GauntStrelok]

This was in a note inside a file, i wanted to have some discussion in here, the thing is to replace the + and - buttons to make the list larger or shorter, and put a draggable bar to make it more dynamically.

I have found out this on jsFiddle:
http://jsfiddle.net/tduyck92/

We can create another div under the expandableList div and add it some height to use as a resizer, as the expandableList gets resized, we should resize the inner lists too.