Question: AIR's `spark.components.WindowedApplication` would resize its contents automatically as I manually stretch window bounds or maximize/restore it. But `spark.components.Window` class does not provide such functionality 'out of the box': the contents of the Window don't change their size as I stretch/maximize/restore the window, when the corresponding `spark.components.Window.nativeWindow` instance does resize its bounds. My AIR application is required to open multiple windows, and resizable ones. How can I make them automatically resize their contents to match the nativeWindow bounds?

Answer: 
Assuming you mean the `spark.components.Window`, this is based on the skinnablecontainer so there shouldn't be anything preventing you from using a percentbased layout / constraint. 

```mxml
<s:Window xmlns:fx="http://ns.adobe.com/mxml/2009" 
          xmlns:s="library://ns.adobe.com/flex/spark" 
          xmlns:mx="library://ns.adobe.com/flex/mx" 
          width="100%" height="100%">

```

Other methods for manually handling this sort of thing include listening for the ResizeEvent coming from the stage.
The solution is to listen to a RESIZE event coming from the NativeWindow and then to manually set `stageWidth` and `stageHeight` on Window's `stage` instance. See code below.

```
override public function open(openWindowActive:Boolean=true):void {
    super.open(openWindowActive);

    if (nativeWindow) {
        chromeWidth = nativeWindow.width - this.width;
        chromeHeight = nativeWindow.height - this.height;
        nativeWindow.addEventListener(NativeWindowBoundsEvent.RESIZE, onNativeResize);
    }
}

private function onNativeResize(event:NativeWindowBoundsEvent):void {
    stage.stageWidth = event.afterBounds.width - chromeWidth;
    stage.stageHeight = event.afterBounds.height - chromeHeight;
}

```