setCellVerticalAlignment(panel, HasVerticalAlignment.ALIGN_TOP);
FlowPanel generalPanel = new FlowPanel();
panel.add(generalPanel, "General");
generalPanel.setWidth("100%");
general = new PropertyViewer(false, false);
general.setWidth("100%");
generalPanel.add(general);
FlowPanel detailPanel = new FlowPanel();
panel.add(detailPanel, detailPanelLabel);