dd1 was just beginning to tell us that she had had a wee - "oh, it's all wet"
what we did know (from having to collect urine samples) was that she hated having wet trousers, and that did work in our favour, in that at least she was aware she had done a wee.
dd1 is not motivated by rewards usually either. we used a dvd tht she loves (Singing Hands), and had it ready to go permanently. To start with, we withdrew it for a few days, so she was desperate to watch it, and then we sat her (protesting) on the toilet, then immediately played some of the dvd as a reward. then straight beck to the toilet (still protesting) then another few minutes of dvd. we did this for half an hour or so, to try to make the link between sitting on toilet and her fav dvd. it worked very quickly (dd1 was freaked by the idea of sitting on the toilet - change never a good thing for her), and she was soon asking to sit on the toilet so that she could watch some Singing Hands.
So then we put her into pants and sat her on the toilet whenever she asked (still no wees).
At around lunchtime, we tried to keep her close to the toilet as possible - ideally her sitting on the toilet - while we read/sang songs/etc in the hope of catching a wee.
usually we didn't, and dd1 would hold on until desperate. we have had quite a few successes, but dd1 only wees once a day, so we have a hard time getting the continuity for her. we rewarded every wee, not just those on the toilet, as we want her to get the idea that weeing is god, and holding not necessary.
dd1 has real issues with drinking, so doesn't get enough fluids to wee more often...
within 2 weeks she was reliably dry in the day, as she doesn't like having wet trousers. she has grasped the idea not to wet trousers/pants - we are stil working on the weeing bit! She has never had an accident outside the house, even when we were delayed getting home once - she must have a pelvic floor to die for
she will either hold all day and then have a wee after tea, or if she hasn't drunk enough, she can hold on until she gets her night nappy. Although, she isn't purely waiting for the nappy, as she doesn't wee instantly (or even before she goes to sleep), so it is a case of not drinking enough to feel the need to go. we haven't tackled overnight yet, as she cannot open her door to get to the toilet, and also cannot dress/ndress herself so would need assistance, and I'm not ready for the broken nights yet . Also, she poos first thign in the morning, in her nappy, and we are taking a very slow relaxed approach to toiletting, and haven't got around to tackling poos yet. Small baby steps is our view