flex image button

package
{
    import mx.controls.Button;

    public class ImageButton extends Button
    {
        [Embed(source="assets/image/button.png")]
        private var icon:Class;
        [Embed(source="assets/image/buttonon.png")]
        private var overIcon:Class;
        [Embed(source="assets/image/buttondown.png")]
        private var downIcon:Class;
    
        public function ImageButton()
        {
            super();
            this.label = "";
            this.width = 16;
            this.height = 16;
            this.setStyle("cornerRadius",8);
            this.setStyle("icon",icon);
            this.setStyle("downIcon",downIcon);
            this.setStyle("overIcon",overIcon);
            this.setStyle("upIcon",icon);
        }
    }
}