public function TopMost()
    {
        $sql = Access::SqlBuilder();
        $tblOption = RadioOption::Schema()->Table();
        $where = $sql->Equals($tblOption->Field('RadioField'), $sql->Value($this->radio->GetID()))
                ->And_($sql->IsNull($tblOption->Field('Previous')));
        
        return RadioOption::Schema()->First($where);
    }