Flex中如何隐藏组件并且不占空间
只要设置visible="false" includeInLayout="false" 就好了

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"><mx:VBox width="100%"><mx:HBox width="800" height="100%"><mx:Button label="test1" width="300" visible="false"/><mx:Button label="test2" width="300" /></mx:HBox><mx:HBox width="800" height="100%"><mx:Button label="test3" width="300" visible="false" includeInLayout="false"/><mx:Button label="test4" width="300" /></mx:HBox></mx:VBox></mx:Application>