Thanks for Your Info , I too went through that example, That is where my problem starts , Since in this case the SystemChrome is none , The Default button icons ( Close , Maximize , Minimize ) is modified and It is replaced by grey small icons , Which is not good.
My goal is to retain the Defautlt Title Bar Button Icons.
Any pointers appeciated.
you can try to hide evenrything using
<!-- The type of system chrome to use (either "standard" or "none"). Optional. Default standard. -->
<!-- Whether the window is transparent. Only applicable when systemChrome is false. Optional. Default false. -->
and then in the mxml create your own custom bar
using standard hbox canvas images
<mx:VBox horizontalScrollPolicy="off" verticalScrollPolicy="off" id="headerContainer" width="100%" height="120" ...
but in that way you need images instead of standard buttons
when I have time I can try to make some test about this