code/Debug/controllers/ModuleController.php
public function enableAction()
    {
        $moduleName = (string)$this->getRequest()->getParam('module');

        try {
            $this->getService()->setModuleStatus($moduleName, true);
            $this->getService()->flushCache();
            Mage::getSingleton('core/session')->addSuccess('Module was enabled.');
        } catch (Exception $e) {
            Mage::getSingleton('core/session')->addError('Unable to enable module: ' . $e->getMessage());
        }

        $this->_redirectReferer();
    }
public function enableAction()
    {
        $moduleName = (string)$this->getRequest()->getParam('module');

        try {
            $this->getService()->setModuleStatus($moduleName, true);
            $this->getService()->flushCache();
            Mage::getSingleton('core/session')->addSuccess('Module was enabled.');
        } catch (Exception $e) {
            Mage::getSingleton('core/session')->addError('Unable to enable module: ' . $e->getMessage());
        }

        $this->_redirectReferer();
    }
Enables specified module