Printing with flash

I have a MovieClip map inside I have a **UILoader **where I load a map, this map is very big so I need to use a mask:

// Draw the mask
var square:Sprite = new Sprite();, 0x000000);;, 0, 600, 600);;

mapa.mask = square;

var myPrintJob PrintJob = new PrintJob();

when the parameter **scaleContent **of the **UILoader **is **true **print the map, but I need this parameter to be false, and when it is false it donĀ“t print

What I am doing wrong?
Thanks for your time.