D.G.
Ah yes, the time out chair. I used the time out chair for my second boy, it was the only thing that worked with him, however it was a challenge to get him to stay. I finally put him in the hallway facing away from the livingroom, away from any walls and anything he could touch. I repeatedly told him that everytime I had to tell him to sit back down I was going to restart the time and he couldn't get back up until then. I also repeatedly told him that I wasn't going to answer any of his questions and everytime he talked to me I was going to restart the timer. It took pressistance, but in time he saw that I was just as if not more stubborn then he was. After a while all I'd have to say to him is "go get the time out chair." and he'd be on his best behavior and stop whatever it was he was doing.
Good luck, it'll all come around eventually!