public function setActiveSelectionByIndex($iIdx)
    {
        if (($aSelections = $this->getSelections())) {
            $iSelIdx = 0;
            foreach ($aSelections as $oSelection) {
                $oSelection->setActiveState($iSelIdx == $iIdx);
                if ($iSelIdx == $iIdx) {
                    $this->_oActiveSelection = $oSelection;
                }
                $iSelIdx++;
            }
        }
    }