Flash actionscript drawing

how would i go about using a draw code(Code that allows users to draw within the flash) and restricting it to a certain size and location on the movie? for instance a 75x75 box located at xPos=200 and yPos = 150?

Like would I have to use a blank movie clip for the position? then make an invisible box within it to restrict drawing area?

any help would be appreciated.:stuck_out_tongue: