defines a vertical Box container by using the tag:
<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:VBox borderStyle="solid" paddingTop="10" paddingBottom="10" paddingLeft="10" paddingRight="10"> <mx:Button id="fname" label="Button 1" /> <mx:Button id="lname" label="Button 2" /> <mx:Button id="addr1" label="Button 3" /> <mx:ComboBox id="state" /> </mx:VBox> </mx:Application>