frame_rate_txt.text = String(stage.frameRate); increase_btn.addEventListener(MouseEvent.CLICK, onIncreaseRateClick); decrease_btn.addEventListener(MouseEvent.CLICK, onDecreaseRateClick); function onIncreaseRateClick(evt:MouseEvent):void { stage.frameRate += 5; frame_rate_txt.text = String(stage.frameRate); } function onDecreaseRateClick(evt:MouseEvent):void { if (stage.frameRate > 5) { stage.frameRate -= 5; } frame_rate_txt.text = String(stage.frameRate); }