void (final XmlWriter writer, final RadContainer radContainer) { CardLayout layout = (CardLayout) radContainer.getLayout(); writer.addAttribute(UIFormXmlConstants.ATTRIBUTE_HGAP, layout.getHgap()); writer.addAttribute(UIFormXmlConstants.ATTRIBUTE_VGAP, layout.getVgap()); String defaultCard = DefaultCardProperty.INSTANCE.getValue(radContainer); if (!StringUtil.isEmpty(defaultCard)) { writer.addAttribute(UIFormXmlConstants.ATTRIBUTE_SHOW, defaultCard); } }