MACROMEDIA FLASH MX 2004-ACTIONSCRIPT LANGUAGE Reference page 696

The Flash Player printing feature supports PostScript and non-PostScript printers. Non-
PostScript printers convert vectors to bitmaps.
Example
The following example prints the contents of the Stage when the user clicks the button
. The area to print is defined by the bounding box of the frame.
myBtn_btn
myBtn_btn.onRelease = function(){
printAsBitmapNum(0, "bframe")
};
See also
print(), printAsBitmap(),
696 Chapter 2: ActionScript Language Reference
PrintJob class, printNum()