VerticalLayout Group
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:s="library://ns.adobe.com/flex/spark"> <s:Group> <s:layout> <s:VerticalLayout variableRowHeight="false" typicalLayoutElement="{btn3}" /> </s:layout> <mx:Button id="btn1" label="(1) button" /> <mx:Button id="btn2" label="(2) button" height="50" /> <mx:Button id="btn3" label="(3) button" height="30" /> <mx:Button id="btn4" label="(4) button" /> </s:Group> </mx:Application>