Review handle bar was draggable with mouse due to the mouseup, mousedown

and mousemove events. However, there were no events to allow for 

touchscreen access and thus the handle bar was not draggable for 

touchscreen devices.
We are now utilizing pointer events instead of mouse events to account 

for touchscreen input.

Tested in Chrome and Firefox browser using touchscreen accessibility

mode. Also tested mouse events continue working as expected.