printJob question

print_btn.onRelease = function(){
    //var printClip = this._parent.print_mc;
    var my_pj:PrintJob = new PrintJob();
    if (my_pj.start()) {
        var pagesToPrint:Number = 0;
        if (my_pj.addPage("print_mc",{xMin:0,xMax:500,yMin:0,yMax:800})) {
            pagesToPrint++;
        }
        if (pagesToPrint > 0) {
            my_pj.send(); // print page(s)
        }
    }
    
}