QDialog without Title Bar

[Henry Blue Heeler]

Any way to implement/derive a QDialog or QMainWindow without a title bar, i.e. no icon, no title, no [?] or [x].
I need the dialog to be resizable and movable by the user, so

setWindowFlags( Qt::FramelessWindowHint );
// or
setWindowFlags( Qt::SplashScreen );

setWindowFlags( Qt::FramelessWindowHint );
// or
setWindowFlags( Qt::SplashScreen );

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don't do the trick.

Thx for any hints.