Adapted rio_do_hola to use the new SoundManager. Fixed a bug in the sound manager that caused a sound to not be looped if it did not have a callback assigned to it. Looping a stream using timers doesn't loop perfectly. I'll fix this in the future.

<Panel name="errorWindow" title="Error" min_size="300, 100">
	<ScrollArea>
		<Label name="message" text="Error:" wrap_text="1" vexpand="1"/>
	</ScrollArea>
	<Button name="okButton" text="OK"/>
</Panel>