Potty Tricks

OK.  You know you're deep in the throws of mommy-hood when you stare glowingly into the toilet and scream "yay!!!!!  you did it!!!!"

2-year old is out of diapers.  She still wears a pull-up at nap and bedtime.  And --not to get gross here-- but that's usually when she goes #2.  What gives?  She has been going tee-tee on the potty, but she doesn't go #2.  She waits until after nap or when she wakes up, and she leaves the prize in her Dora or Cinderella pull-ups.

Actually, she did it this past Saturday, and this was her reward:

The whole bag!  But then every day since, we're back to going in our pull-up.

What tricks do you use to break this habit?  Help!!