private function onMouseMove(event:MouseEvent):void
              {
                    if (drawing){
                    if (mode == 0)  item.graphics.lineTo(event.localX, event.localY);
                    else if (mode == 1) {
                    if (hold) canvas.removeChild(hold);
                    draw(beginX,beginY, event.localX - beginX, event.localY-beginY);
                    update(event.localX, event.localY);
                    }
                    }
                    trace("move:" // + mouseX + "/" + mouseY + "  :" 
                          + event.localX + "/" + event.localY );
              }