protected function injectorSetup()
    {
        if ($this->_injectorObjects === null) {
            foreach ($this->injectors() as $varName => $injector) {
                $injector->setContext($this);
                $injector->varName = $varName;
                $injector->setup();
                $this->_injectorObjects[$injector->varName] = $injector;
            }
        }
    }