[flexcoders] Newbie question: Showing a vertical scroll bar on application

[Flexy]

Hi,

 

I am adding titlewindows using the popupManager on the application canvas, I
have many of them so some are beyond the screen height, However, no vertical
scrollbar shows - how can I make sure the vertical scroll bar shows if there
are controls beyond the screen height?

 

Thanks,

 

Flexy.