// sort after the values
ArrayHelper.sort(attrKeys, guiTranslatedAttKeys, false, true, true);
// use this sorted keys-values
SingleSelection attribute = uifactory.addDropdownSingleselect(PRE_ATTRIBUTE + rowCreationCounter, null, flc, attrKeys, guiTranslatedAttKeys, null);
attribute.setUserObject(Integer.valueOf(rowPos));
attribute.addActionListener(this, FormEvent.ONCHANGE);
columnAttribute.add(rowPos, attribute.getName());
// 2b) Operator selector
String[] values = OperatorManager.getRegisteredAndAlreadyTranslatedOperatorLabels(getLocale(), operatorKeys);
FormItem operator = uifactory.addDropdownSingleselect(PRE_OPERATOR + rowCreationCounter, null, flc, operatorKeys, values, null);