code: function mouseUp_(ev) {
      var e=ev||event;
      if (moving_) {
        setCursor_(false);
        event_.removeListener(mouseMoveEvent_);
        if (src.releaseCapture) {
          src.releaseCapture();
        }
        moving_ = false;
        event_.trigger(me, "dragend", {mouseX: formerMouseX_, mouseY: formerMouseY_, startLeft: originalX_, startTop: originalY_, event:e});
      }
      currentX_ = currentY_ = null;
      event_.trigger(me, "mouseup", e);
    }
docs: Handles the mouseup event.
  @param {event} ev The event data sent by the browser.
  @private