Reading at the 'UIAnchor - Panel Container with UIRoot.Manual Height problem' post I just thought : can it be a problem that an UIRoot's size reference is always computed using the height of the screen... and indeed it is !
Consider an application that should be run in portrait mode, not knowing in advance the aspect ratio of the screen. If you want a list to fill the screen, you may want it to be designed width-wise and take all available height.
This could be a cool feature to be added.
