AIR - set size of NativeWindow to include system chrome

Question

How do you find out the size of the system chrome so that I can specify the window size to achieve the stage size I want?

If my main window is set at 800 x 600 (stage), and I create a second window as below, it will be smaller.

public function Main():void 
{
    var windowOptions:NativeWindowInitOptions = new NativeWindowInitOptions();
    windowOptions.systemChrome = NativeWindowSystemChrome.STANDARD;
    windowOptions.type = NativeWindowType.NORMAL;
    var newWindow:NativeWindow = new NativeWindow( windowOptions );
    newWindow.width = 800;
    newWindow.height = 600;
    newWindow.stage.scaleMode = StageScaleMode.NO_SCALE;
    newWindow.stage.align = StageAlign.TOP_LEFT;
    newWindow.activate();

}

I assume you increase both newWindow.width = 800; and newWindow.height = 600;to account for the chrome, but how do you find this value?