M.J.
I had the same problem with my son. He would do very well with "pee-peeing" on the potty, but then he would go into his playroom and shut the door to go "poo". So, one day I saw him retreating to his room and took him to the potty and sat him down. I asked him if he wanted a sucker. Of course he said yes! I told him that he couldn't have a sucker until he went poo on the potty. I then told everyone in his life the same thing, Do not give him any candy until he goes poo on the potty. From that point on everytime he asked for a sweet I would tell him he had to go poo on the potty first. After about a few weeks, he went into the bathroom, stayed for a few min. and came out and said that he went poo... (he was telling a story, of course, so he could get a sucker! lol) So, I gave him a sucker and made a big deal about him going poo on the potty A few days later he actually went poo on the potty! I made a big deal about it, (actually, I cried! My baby is a big boy!lol) I gave him a sucker and now he goes on the potty for everything! (And he doesn't even ask me for a sucker everytime! He does however want me to go "look"! lol) It worked for me! Good Luck!