public CustomScroll(JComponent component) {
        scr = new JScrollPane(component);
        scr.setBorder(null);
        scr.setViewportBorder(null);
        scr.setBorder(BorderFactory.createEmptyBorder());
        scr.getViewport().setOpaque(false);
//        scr.setOpaque(false);
//        scr.setBackground(new Color(0, 0, 0, 5));
        verticalScrollBar = scr.getVerticalScrollBar();
        verticalScrollBar.setVisible(false);
        verticalScrollBar.setOpaque(false);
        verticalScrollBar.setUI(new MyScrollBarUI());
        verticalScrollBar.setUnitIncrement(16);

        horizontalScrollBar = scr.getHorizontalScrollBar();
        horizontalScrollBar.setVisible(false);
        horizontalScrollBar.setOpaque(false);
        horizontalScrollBar.setUI(new MyScrollBarUI());

        JLayeredPane layeredPane = new JLayeredPane();
        layeredPane.setLayer(verticalScrollBar, JLayeredPane.PALETTE_LAYER);
        layeredPane.setLayer(horizontalScrollBar, JLayeredPane.PALETTE_LAYER);

        scr.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        scr.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        scr.setLayout(new ScrollPaneLayout() {
            @Override
            public void layoutContainer(Container parent) {
                viewport.setBounds(0, 0, getWidth(), getHeight());
                SwingUtilities.invokeLater(new Runnable() {
                    @Override
                    public void run() {
                        displayScrollBarsIfNecessary(viewport);
                    }
                });
            }
        });

        layeredPane.add(horizontalScrollBar);
        layeredPane.add(verticalScrollBar);
        layeredPane.add(scr);

        setLayout(new BorderLayout() {
            @Override
            public void layoutContainer(Container target) {
                super.layoutContainer(target);
                int width = getWidth();
                int height = getHeight();
                scr.setBounds(0, 0, width, height);

                int scrollBarSize = 10;
                int cornerOffset = verticalScrollBar.isVisible() &&
                        horizontalScrollBar.isVisible() ? scrollBarSize : 0;
                if (verticalScrollBar.isVisible()) {
                    verticalScrollBar.setBounds(width - scrollBarSize, 0,
                            scrollBarSize, height - cornerOffset);
                }
                if (horizontalScrollBar.isVisible()) {
                    horizontalScrollBar.setBounds(0, height - scrollBarSize,
                            width - cornerOffset, scrollBarSize);
                }
            }
        });
        add(layeredPane, BorderLayout.CENTER);
        layeredPane.setBackground(Color.BLUE);
    }
 

/**
 * Constructs a new PluginHistory.
 */
public MarvinPluginHistory()
{
	frameHistory = this;
	
	this.setLayout(new BorderLayout ());

	setResizable(true);
	setDefaultCloseOperation(DISPOSE_ON_CLOSE);
	setTitle("Plug-ins history");
	
	listMarvinImage = new LinkedList<MarvinImage>();
	listMarvinAttributes = new LinkedList<MarvinAttributes>();
	listPluginName = new LinkedList<String>();
	
	panelPlugin = new JPanel();
	
	scrollPanelPlugins = new JScrollPane
	(
		panelPlugin, 
		ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER,
		ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED
	);
	
	
	scrollPanelPlugins.setLayout(new ScrollPaneLayout());		
	add(scrollPanelPlugins);
	
	panelButtonHistory = new JPanel();
			
	buttonExportHistortAsImage = new JButton("Export as Image");
	buttonExportHistortAsImage.addActionListener(new ExportButtonHandler());
	buttonExportHistortAsImage.setMnemonic('I');
	
	// the action listener is still not created
	// so no button appears
	//btnExportHistoricText = new JButton ("Export as Text");
	//btnExportHistoricText.addActionListener (new ExportTexButtonHandler ());
	// ActionListener "ExportTextButtonHandler" need to be created!!!
	//btnExportHistoricText.setMnemonic('T');

	panelButtonHistory.add(buttonExportHistortAsImage);
	//jpBtnHistoric.add (btnExportHistoricText);

	this.add(panelButtonHistory, BorderLayout.PAGE_END);
}