Round Rectangle with Actionscript

A class to generate a rounded cornered rectangle which I am using in one of my current projects:

package {
    import flash.display.DisplayObject;
    import flash.display.Graphics;
    import flash.display.Shape;
    import flash.display.Sprite;

    public class RoundRectangle extends Sprite {
        private var rrX:Number;
		private var rrY:Number;
		private var rrRadius:Number;
		private var rrWidth:Number;
		private var rrHeight:Number;
        private var bgColor:uint;
        private var borderColor:uint;
        private var borderSize:Number;
		private var child:Shape = new Shape();

        public function RoundRectangle(rrX:Number=0,rrY:Number=0,rrWidth:Number=10,rrHeight:Number=10,rrRadius:Number=0,bgColor:uint=0x000000)
		{
            child = new Shape();
            child.graphics.beginFill(bgColor);
           	child.graphics.lineStyle(borderSize, borderColor);
            child.graphics.drawRoundRect(rrX, rrY, rrWidth, rrHeight, rrRadius);

            child.graphics.endFill();
            addChild(child);
        }
    }
}