Mine

_root.createEmptyMovieClip("gaga",0);
gaga.createEmptyMovieClip("gogo",1);
gaga.createEmptyMovieClip("gugu",0);

//on cree un carré de 100x100
with(gaga.gogo){
	beginFill(0x000000,10);
	lineTo(100,0);
	lineTo(100,100);
	lineTo(0,100);
	lineTo(0,0);
	endFill();
}
//on contraint le carré a etre en 10x10
gaga._width = 10;
gaga._height = 10;

//on cree un carré de 100x100
with(gaga.gugu){
	beginFill(0x990000,100);
	lineTo(100,0);
	lineTo(100,100);
	lineTo(0,100);
	lineTo(0,0);
	endFill();
}