explorerPane = new CardPanel();
explorerPane.addView(VIEW_TOOLBOX, toolbox);
explorerPane.addView(VIEW_SIMULATION, simExplorer);
explorerPane.setView(VIEW_TOOLBOX);
attrTable = new AttrTable(this);
zoom = new ZoomControl(layoutZoomModel);
// set up the central area
CanvasPane canvasPane = new CanvasPane(layoutCanvas);
mainPanelSuper = new JPanel(new BorderLayout());
canvasPane.setZoomModel(layoutZoomModel);