If you want to position things in the contentGroup above other things in
Flex 4 there is a layer property.
Popups are not parented by the contentGroup. If you want them to float but
not obscure a titlebar, just change the .y value after it pops up.
Yeah, I was wondering if there was a way to add the titleBar so that flex knows it's part of the application chrome and should not be obscured by popups. As it is, a modal popup locks the user out of the ability to close, minimize, move, and resize a window.
PopUpManager doesn't care about application chrome. PopUps float above the
application (they fit within AIR NativeWindow chrome, though).