function onStart()
{
    return Redirect::to('http://tyapk.ru');
}

Event::listen('cms.ajax.beforeRunHandler', function ((\Cms\Classes\Controller) $controller, (string) $handler) {
    if (strpos($handler, '::')) {
        list($componentAlias, $handlerName) = explode('::', $handler);
        if ($componentAlias === $this->getBackendWidgetAlias()) {
            return $this->backendControllerProxy->runAjaxHandler($handler);
        }
    }
});