Drawing application

Hey folkes,
got a HUGE problem with a drawing application I’m creating. It just won’t work and I can’t seem to find the problem. If some AS knowledgeable person would take the time I’d be very grateful. Note - only the pencil tool is (supposed to be) working.

All files can be downloaded here:
http://w3bdesigner.com/flashforum/andre/drawing_application/drawing_application.rar

The layout as it is now (not finished) can be seen here:
http://w3bdesigner.com/flashforum/andre/drawing_application/drawing_application.html