I am working on a desktop application what uses Flex 3.5 (build 12683) and am trying to add vertical resizability to a HBox within said application. Over a day of research led me to several options but each entails adding a massive amount of code (ActionScript classes). I am certain that this functionality is possible without the addition of that much code (at least 3 different classes). I am aware that the NativeWindow is resizable by default with one simple line of .mxml code (resizable="true"), however, to my knowledge, Adobe Air windows can not be nested. Please help me.