I want to hide the blue title bar from my adobe air application

Hello

I'm doing an aplication with Flash CS4, using adobe air in as3. I have some frames, and in the frame 25 there's a stop, when user clicks a button, go ahead to frame 27 and stage resize the whole screen, just like a FULL_SCREEN, and then I load an pdf. I can't use FULL_SCREEN or FULL_SCREEN_INTERACTIVE property, because doesn't works the pdf loaded (even adobe help say it), so I would like to simulate it. The application it will be use in windows ( I am not sure if XP, vista, but windows). So when resize the stage, to load pdf, then and ONLY then, I want the title bar disappears, just to simulate full_screen.

How can I do, to make in a desktop application that ?

Thanks in advance