formChildren = new ArrayList<Element>();
}
formChildren.add(section);
// add new horizontal column to section
Column column = new Column();
column.setProperty("horizontal", "true");
Collection<Element> columnChildren = new ArrayList<Element>();
column.setChildren(columnChildren);
sectionChildren.add(column);
Element hiddenField = (Element) pluginManager.getPlugin(HiddenField.class.getName());
hiddenField.setProperty(FormUtil.PROPERTY_ID, "_json");
hiddenField.setProperty(FormUtil.PROPERTY_VALUE, json);