// toolbar.add(Box.createHorizontalStrut(5));
toolbar.add(filterButton);
JScrollPane treeScroll = new JScrollPane(tree);
JXLayer<JScrollPane> treeScrollLayer = new JXLayer<JScrollPane>(treeScroll,
new MouseScrollableUI());
JScrollPane infoScroll = new JScrollPane(infosArea);
TitledPanel infosPanel = new TitledPanel(MESSAGES.getString("NodeInformations"));
infosPanel.setLayout(new BorderLayout());
infosPanel.add(infoScroll, BorderLayout.CENTER);