Graphics Flash ActionScript

package
{
    import flash.display.*;
    import flash.geom.Matrix;
    public class Main extends Sprite
    {
        public function Main()
        {
            var shape:Sprite = new Sprite();
            shape.x = 100;
            shape.y = 100;
    
            var mxBox:Matrix = new Matrix();
            mxBox.createGradientBox(200, 200);
    
            shape.graphics.lineStyle(25);
    
            shape.graphics.lineGradientStyle("linear", [0xFFFF00, 0x00FFFF],  [100, 100], [0x00, 0xFF], mxBox, "reflect", "linearRGB");
            shape.graphics.curveTo(200, -100, 400, 0);
            shape.graphics.lineTo(400, 200);
            shape.graphics.lineTo(0, 200);
            shape.graphics.lineTo(0, 0);
            shape.graphics.endFill();
            addChild(shape);
        }
    }
}