var gradientWidth:int = 100;
var gradientHeight:int = 300;
var angle:Number = 0;
			
var matrix:Matrix = new Matrix();
matrix.createGradientBox(gradientWidth, gradientWidth, (Math.PI / 180) * angle, 0, 0);
			
graphics.beginGradientFill(GradientType.LINEAR, [0xefefee, 0xa4a5a7], [1, 1], [0, 255], matrix);
graphics.drawRect(0, 0, gradientWidth, gradientWidth);
graphics.endFill();

http://www.nightdrops.com

Actionscript gradient

ActionScript 3