Re: PL'ing question...
Personally I would just stick him in underware until he is ready. Yeah you are going to have messes to clean up but just help him change and have him help you clean it up. He will eventually get sick of cleaning up the mess and not being able to play. Don't yell at him, don't shame him, but stop going back and forth between diapers and underware. He knows the difference and he knows that he can just be lazy. I would just put him in underware for the next couple of weeks and just mention it when you go and you need to try to go several times a day, like hourly. If he doesn't start going in like 2 weeks put him in diapers day and night non stop for 2 weeks or longer and then try agian.