Hide seleceted enum values in form control through X++ (X++로 화면 컨트롤의 선택된 이넘값 숨기기)

(Form - classDeclaration)
public class FormRun extends ObjectRun
{
 SysFormEnumComboBox     _SysFormEnumComboBox;
 Set                     _EnumSet
}
(Form - init)
public void init()
{
    _EnumSet = new Set(Types::Enum);
    _EnumSet.add(ABC::A);
    _EnumSet.add(ABC::B);
    _SysFormEnumComboBox = SysFormEnumComboBox::newParameters(element,
                                                              element.controlId(formControlStr(Form name, Enum control name)),
                                                              enumName2Id(enumStr(ABC)), _EnumSet);
    super();
}