public function getConfigSource(Zend_Controller_Request_Abstract $request, $useFallback = false)
    {
        $store = $request->getParam('store');
        $website = $request->getParam('website');

        if ($store) {
            $storeObj = Mage::app()->getStore($store);
            // specific store view should fall back to website store view is in
            return $useFallback ? $storeObj->getWebsite() : $storeObj;
        }
        if ($website) {
            $websiteObj = Mage::app()->getWebsite($website);
            // website should fall back to default store
            return $useFallback ? Mage::app()->getStore(null) : $websiteObj;
        }
        // default to default store
        return Mage::app()->getStore(null);
    }