scroll down doesn't work

[SMNRST]

ngSelectable works great except if the list of items is long, we put it inside a div that will overflow at a certain height. The problem is that if the user clicks and drags to select multiple items in the list and they want to be able to select items that are not visible but in the overflowed portion of the div, if they drag their mouse down outside of the div, it doesn't automatically scroll to the "hidden" portions of the div like a normal multi-select element would.