When Stats is removed from the stage, it should clean up after itself. This
is especially important if it used in a SWF that may be unloaded because
Stats could keep the SWF in memory!

Add the following line to the end of the init function:

addEventListener(Event.REMOVED_FROM_STAGE, destroy);

Then add this function to clean up the event listeners and the bitmapdata:
		
private function destroy(e : Event) : void
{		
	removeEventListener(MouseEvent.CLICK, onClick);
	removeEventListener(Event.ENTER_FRAME, update);
	removeEventListener(Event.REMOVED_FROM_STAGE, destroy);

	_graph.dispose();
}