It would be nice to load a complete GUI via an XML file.
Such a file could have the following structure
<?xml version="1.0"?>
<PyUI xmlns="http://pyui.sourceforge.net">
<Desktop width="800" height="600" fullscreen="true">
<Frame>
<Button ID="Button1" Label="Hello"
Action="SomeAction_CallBack"
BackgroundImage="./NiceImage.png">
</Button>
</Frame>
</Desktop>