Considering we both work 8 hours a day and can't get home to let a puppy out of a crate, I'm encouraged reading this thread, as we are also training our Chloe in a Xpen. It's large enough that on one end she can eat, sleep, play and on the other is her pee pad.
The verdict is still out, as it's only been 7 days since we've had her, but she's had success the past couple of days and I'm hopeful that this will be the way to go. I keep reading how notoriously difficult Yorkies can be to potty train.