Hi Beeps,
I used to do the Freeze thing like Jonesey mentioned but these days when I have to bounce a drum track that uses a synth, this is what I do.
Go to "tracks" tab, select "bounce to tracks"
Then while in that menu of options, source category "tracks", make sure you have the right things checked in the boxes, click ok and it quickly creates individual wave files of your drums.
I feel this works much better than freeze and is faster to process. This of course is not to take away from what Jonesey has mentioned, I just feel that in my personal use, bounce works so much better and faster for me, I don't freeze anything anymore. And....I still have my original files in tact that I can always mute and archive.
The other thing you can do if you really want to is split the midi up into individual tracks. Hi-lite the midi, choose process, then look for the arrow and choose "run CAL".
Select "split notes to tracks" and the original midi will be stripped out and transferred to individual midi tracks. This is really good for hybriddin multiple drum modules. Like if you wanted the kick drum from Session Drummer, the snare from BFD and the hats from EzDrummer or whatever....you would now have individual midi outputs to send things to the module of your choice.
The only down side to it for me is...the stock split notes to track cal file names the tracks by midi note number instead of kick, snare, hats etc. You can edit the CAL file via notepad to make it say kick, snare etc but you'll need to experiment a bit and get your mapping down for that. I have several custom cal files that I've created that work off of my mappings, so when I have to use one, it literally says kick, snare, snare rim, snare edge, tom 1, tom 1 rim and so forth.
So one of the above methods may be what you're looking for....but all of them should work and get you where you need to be. :)
-Danny