I just downloaded your calendar class and tried using it. However I got some errors that didn't show up in your example. One was undefined property monthText, which I just added a var and type infront of, there was a bunch of errors for undefined property for the text format such as font, bold, etc. I just removed those and it didn't change anything. The other one I couldn't figure out how to fix was:
Implicit coercion of a value with static type movieClip to a possibly unrelated type displayObject. This is where you set the event handlers for the days. I changed your code to scope the movieClip as a displayObject, and everything still works, but now the hand is gone when you mouseover the days (since it is a dispaly object). I was wandering if anyone else tried to use Sleeve's calendar and ran into the same problems.