T.W.
I had this problem with my daughter. For her it was a power play. I started using a timer so that the "nagging" was coming from the timer, not me. She knew when the timer went off, it was time to go potty. I also made doing the things she wanted to do conditional on going potty. Want to watch Dora you say? "Yes you can, just as soon as you go potty." I also made her a sticker chart just like when we were potty training. For every week full of stickers, we would go to Target for a small reward.