changing the ScreenSize from <800x480> to <1024x600> will just increase the size that is "reserved" as display area for your GUI application - it does not mean that this area is filled somehow automatically.
If you want to have a GUI application with a native resolution of <1024x600> you should set ScreenSize to <1024x600> and the Bounds of the application class to <1024x600> (see adjust the size of the application component). Then you can add your GUI components and create the GUI application with the desired display size.
The Prototyper is always using the size defined by ScreenSize - but the entire area has to be used by the GUI application.
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