These stocks may be down as of late, but investors shouldn't count them out in the long run.It can take a while for growth stocks to reach their full potential, which is why they can make for good long-term options to hang on to. Along the way, however, they can encounter difficulties that send their valuations down. But those declines in value could prove to be temporary, and that's why buying solid growth stocks when they are down can be a great move in the long run.Three stocks that look to have solid gr ...