When I was in Tibet on the Friendship Hwy, I didn't have trouble with stonethrowing kids, but youngsters along the road could get seriously annoying - from begging to trying to steal stuff from my backrack to slowing me down by holding on the panniers! After 2,3 incidents I just gragged my "dogstick", holding it so that everybody ahead could see it. Suddenly everybody behaved very nicely...

I would advise to pick up some stones yourself and make sure they see them. Otherwise you could stop and try to interact. Not a good idea would be giving handouts like stickers, pens, sweets, or even money. It would even more encourage them to keep this behavior.