big boy underwear

Last week Cooper started potty training. We went and bought his "big boy underwear", he picked them out and was so proud when he put them on. He did great at school, he only had 2 accidents at school. Home is a different story! HE.WILL.NOT.GO. He will sit on the potty for a few seconds and say "all done" when really he has not done anything. He will go if we put him in a diaper or pull-up. I need to remember it has only been a week and this we new for him and for us. He will get it.