Woo hoo! What a great site. So I rescued my wrist warmer by doing a bit a frogging for the first time! I'm knitting in the round, so I was a bit intimidated but with a little patience it worked out. I'm ready to tackle the button hole again when I get to it.
And just a tip for frogging in the round: You will end up one row above where you started picking up the stitches, thats how knitting in the round works, don't let it throw you off!