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 title="Elevation Editor">
	<HBox>
		<VBox name="Metadata Properties">
		</VBox>
		<VBox>
			<Button name="layerButton" text="Edit Layer"/>
			<Spacer /> 		
			<Button name="closeButton" text="Close"/>
		</VBox>
	</HBox>
</Panel>