I seem to be having issues with starting a new message with a list of addresses already entered. Per the code, I should be able to do the following, but it doesn't work. Any ideas?

Code:
var cc = ZmAppCtxt.getApp(ZmZimbraMail.MAIL_APP).getComposeController();
cc.doAction({action:ZmOperation.NEW_MESSAGE,toOverride:'test@test.com'});