public function GetActiveStartValue()
    {
        $sStartValue = false;
        if (is_array($this->aActiveFilterData) && array_key_exists(self::URL_PARAMETER_FILTER_START_VALUE, $this->aActiveFilterData)) {
            $sStartValue = $this->aActiveFilterData[self::URL_PARAMETER_FILTER_START_VALUE];
        }

        return $sStartValue;
    }