K.V.
At this age, it seems that it would more than likely be a physical issue (assuming there are no traumatic events going on) take him to the pediatric urologist that was recommended by someone else and get him checked out by more than your regular doctor and if it is a physical problem then switch regular doctors too, because you really want someone more proactive than jsut "positive reinforcement guy". You need to find out the cause before this traumatizes the young guy. Also, they now have some depends style things for kids... but I would say that is a last resort and only if it is a physical issue, because that could be traumatic for him too.