My 15 month grandson spends a lot of time in a corral to keep him away from things where he can be hurt. This morning he began shaking the corral, pushed it into a wall, kept shaking and pushing, and damaged the wall. Each time I told him No, he looked at me and defiantly pushed and shook the corral. I placed barriers between the wall and the corral so I could just ignore his challenges. Is this a reasonable approach? Or should I give him a timeout in his bedroom?