Constrain drawing API through _X and _Y?

I was wondering is there was a way of constraining it this way though x & y coords?

For example: User can only draw within a specified area. Like setting specified boundary zone for the mouse on click maybe?

I’ve tried using just a seperate .swf for the signature alone but when I import it to Director it doesn’t recognize the drawing capabilities. Is this possible at all?

ANy help is appreciated.

Thanks All,
Limitlis