editors = new TabSheet();
editors.setSizeFull();
editors.addStyleName("borderless");
editors.addStyleName("editors");
editors.setCloseHandler(new CloseHandler() {
@Override
public void onTabClose(TabSheet tabsheet, final Component tabContent) {
VerticalLayout l = new VerticalLayout();
l.setWidth("400px");
l.setMargin(true);