I think I found a bug with this componenet.
I wrote the following code:
final RadioGroupItem showActive = new RadioGroupItem();
showActive.setVertical(false);
showActive.setTitle(messages.labelShowOnlyActive());
LinkedHashMap<String, String> yesNo = new LinkedHashMap<String, String>();
yesNo.put("1", messages.labelYes() );
yesNo.put("0", messages.labelNo() );
showActive.setValueMap(yesNo);
showActive.setDefaultValue("0");
showActive.setColSpan(2);
showActive.setCellStyle("customRadioCell");
but the cell’s class are still set to formCell …