This works:
This has a problem using the spin buttons (they stop running after one click in each direction):
Note the only difference is the MaxLength=3 at the end. If the Increment Step is 1, then it also works. It has something to do with the last digit and maxlength, I think.
This is in 2009.3 (Jan release). Not sure if it's in 2010.1, since that just arrived.