停靠ApplicationControlBar组件.

dock属性 true|false
示例：

代码：

<? xml version="1.0" encoding="utf-8" ?>
<!--  http://blog.flexexamples.com/2007/08/25/docking-an-applicationcontrolbar-container/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white" >

     < mx:ApplicationControlBar  dock =" {checkBox.selected} " >
         < mx:CheckBox  id ="checkBox"  label ="dock"   />
     </ mx:ApplicationControlBar >

</ mx:Application >