manager = new ImageCanvasMng(this);
manager = new ImageCanvasMng(this, control);
    public ImageCanvas(ViewerUIF view, ViewerCtrl control)    {        this.view = view;        this.control = control;        filters = new ArrayList();        manager = new ImageCanvasMng(this);        magFactor = 1.0;        setBackground(Viewer.BACKGROUND_COLOR);         setDoubleBuffered(true);    }