public function getPlacementOptions()
    {
        return [
            self::PLACEMENT_AUTO => _t(__CLASS__ . '.AUTO', 'Auto'),
            self::PLACEMENT_TOP => _t(__CLASS__ . '.TOP', 'Top'),
            self::PLACEMENT_LEFT => _t(__CLASS__ . '.LEFT', 'Left'),
            self::PLACEMENT_RIGHT => _t(__CLASS__ . '.RIGHT', 'Right'),
            self::PLACEMENT_BOTTOM => _t(__CLASS__ . '.BOTTOM', 'Bottom'),
        ];
    }