   return false
 
 
-performDrag = (callbacks) ->
+performDrag = (event, callbacks) ->
   start_drag_x = event.pageX
   start_drag_y = event.pageY
 

      
      # dragging
      if not skip_drag
        performDrag
          complete: (result, event) ->
            delta =
              top: 0


      # dragging
      if not skip_drag
        performDrag event,
          complete: (result, event) ->
            delta =
              top: 0
