public void selectionChanged(ProjectExplorerEvent event) {
Object selected = event.getTarget();
if (selected instanceof ProjectExplorerToolNode) {
Tool tool = ((ProjectExplorerToolNode) selected).getValue();
if (tool instanceof AddTool) {
AddTool addTool = (AddTool) tool;
ComponentFactory source = addTool.getFactory();
if (source instanceof SubcircuitFactory) {
SubcircuitFactory circFact = (SubcircuitFactory) source;
Circuit circ = circFact.getSubcircuit();
if (proj.getCurrentCircuit() == circ) {
AttrTableModel m = new AttrTableCircuitModel(proj, circ);