[Kikasso]

folderList.mc это кто?

var fl:MovieClip = folderList.createEmptyMovieClip("fl", 2);
fl._x = data.menu.attributes.xpos;
fl._y = data.menu.attributes.ypos;

var mask:MovieClip = folderList.createEmptyMovieClip("mask", 5);
with( mask ){
 beginFill(0xFF0000);
 moveTo(10, 10);
 lineTo(100, 10);
 lineTo(100, 100);
 lineTo(10, 100);
 lineTo(10, 10);
 endFill();
}

fl.setMask( mask );