gradient background using as2 code

wSize = Stage.width;
hSize = Stage.height;
fillType = "linear";
colors = [0xFF0000, 0xFFFF00];
alphas = [100, 100];
ratios = [0, 255];
matrix = {matrixType:"box", x:0, y:0, w:wSize, h:hSize, r:90/180*Math.PI};
_root.lineStyle(1, 0xFFFFFF, 0);
_root.beginGradientFill(fillType, colors, alphas, ratios, matrix);
_root.lineTo(wSize, 0);
_root.lineTo(wSize, hSize);
_root.lineTo(0, hSize);
_root.lineTo(0, 0);
_root.endFill();


out put looks like :-