canvas = new ImageCanvas(this); layer.add(canvas, new Integer(0));
drawingCanvas = new DrawingCanvas(); canvas = new ImageCanvas(this, control); layer.add(canvas, new Integer(Viewer.IMAGE_LEVEL));
	private void buildGUI()	{        Container container = getContentPane();        layer = new JLayeredPane();        canvas = new ImageCanvas(this);                layer.add(canvas, new Integer(0));        scrollPane = new JScrollPane(layer);        container.add(toolBar, BorderLayout.NORTH);        container.add(buildMain(), BorderLayout.WEST);        container.add(scrollPane, BorderLayout.CENTER);        //Configure the display buttons in the TaskBar.        configureDisplayButtons();	}