DragHandler link fix (custom event handling)
DragHandler link fix (custom event handling)

See DragHandler as an example of a custom higher order event handler. (Fixed link here.)
tommymessbauer/mercury,Raynos/mercury,eightyeight/mercury,mpal9000/mercury,eriser/mercury,staltz/mercury,vlad-x/mercury,beni55/mercury,staltz/mercury,martintietz/mercury,jxson/mercury