Put both VBox and HBox to Canvas
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"> <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" > <mx:VBox width="400" height="300" verticalGap="20"> <mx:Button label="Button"/> <mx:ComboBox/> <mx:Spacer height="120"/> <mx:LinkButton label="Link Button"/> </mx:VBox> <mx:HBox x="400" horizontalGap="10" top="15"> <mx:Canvas> <mx:Button top="50" label="Button" y="20"/> </mx:Canvas> <mx:Panel height="140" width="140"/> <mx:Spacer width="125"/> <mx:LinkButton label="Label"/> <mx:ComboBox/> </mx:HBox> </mx:Canvas> </mx:Application>