My oldest son wet until recently actually ... and he's 15. We tried all the other "solutions" out there too. No drinking after 4pm, waking him up before we went to bed to go to the bathroom, etc etc etc. NOTHING stopped the wetting.
I had a brother who wet until he was around 10 or so and an uncle who still wet occassionally into his early 20's. So I knew it was a genetic thing and would clear up on it's own.
We went with the pull ups and a plastic sheet on his bed under the regular sheets, that way the mattress didn't get wet, for a little while. Then we eventually ended up going with medication, DDAVP, and it worked FANTASTICALLY.
One of the main questions our pediatrician asked when we talked about solutions was "has he ever been dry at night?" and for us the answer was No. Which let him know that it wasn't something emotional that was causing it, but rather physical. My son's body was bigger than the glands that control all that, he was the size of the average 12 year old at 8.
If there have been extended periods of dryness at night then it's more likely some sort of emotional upheaval causing the wetting. And talking to the child to find what's upsetting them would probably work.
My pediatrician told me to not worry about it too much(and to NOT blame my son), he had never known anyone who graduated from high school still wetting the bed every night and my son wouldn't either.