foreach($modelCustomerAccounts as $modelCustomerAccount){
            $modelCustomer = Mage::getModel($customerModelClass);
            $customers[] = $modelCustomer->load($modelCustomerAccount->getCustomerId());

public function createObjectOnTheFly($modelName,$model)
    {
        $newObject = Mage::getModel($modelName . "/$model");
        return $newObject;
    }

public function __construct(
        MagentoBackendBlockTemplateContext $context,
        MagentoCatalogModelCategoryFactory $categoryFactory,
        array $data = []
    )
    {
        $this->_categoryFactory = $categoryFactory;
        parent::__construct($context, $data);
    }