Line Segment - Shared Object

I would like a SWF built with AS3 that does the following: a) user can create line segments or draw b) user can only draw with "blue" c) user cannot select line thickness - it is already pre-defined d) user can "undo" line segments or drawings (up to 10 steps or so) e) drawing is AUTOMATICALLY saved to local shared object f) user can click a button to clear the shared object g) source FLA must be provided to me in Flash CS3, NOT Flex. Pretty simple project, but I can't get the sharedobjects to work. I've posted a sample FLA that does some of the above. Thanks!