Backend\Modules\Extensions\Actions\Modules::loadData PHP Method

    private function loadData()
    {
        // get all manageable modules
        $modules = BackendExtensionsModel::getModules();
        // split the modules in 2 separate data grid sources
        foreach ($modules as $module) {
            if ($module['installed']) {
                $this->installedModules[] = $module;
            } else {
                $this->installableModules[] = $module;
            }
        }
    }