What is a calendar control?
Don't know about in CS4 but in CS3 if you go Window > Components > User interface there's a 'DateChooser' component -
sounds like that's what you're after?
Actually there exists DateField and DateChooser components in Component panel under User Interface tag. The point is they are of AS2 components so you should have AS2 selected in your publishing settings dialog for your current project to view these components in the panel. And there is no AS3 version of the component available by default. But if you are looking for an AS3 version of DateChooser component then you can download one from here http://www.flashscript.biz/components/flash9datechooser/datechooser.html
ps: pls mark this post as Answered if this help you resolve your query.