Resizing RenderWindow centers MyGUI elements

Hey,

I'm rendering my scene and my GUI inside an Ogre::RenderWindow.
When the user resizes the window all widgets get suddenly centered. I can not explain this behavior to me.
Does someone have a genius idea whats going wrong?

Thanks alot
Jochen

You have widgets with Center align. Such widgets are centred any time you resize parent widget or window (for root widgets).