1、组件添加事件监听，鼠标移入，移除

mouseOver="onMouseOver(event)" mouseOut="onMouseOut(event)"

2、鼠标移入显示tooltip

private function onMouseOver(event:MouseEvent):void{
	// tip文本
	var msg:String = "hello";
	// 获取当前组件的绝对位置
	var __point:Point = new Point(this.x, this.y);    
	__point = this.localToGlobal(__point);
	
	tip = ToolTipManager.createToolTip(msg, __point.x + this.width, __point.y) as ToolTip;
}

3、鼠标移除组件时销毁tooltip

private function onMouseOut(event:MouseEvent):void{
	ToolTipManager.destroyToolTip(tip);
}