public void itemStateChanged(ItemEvent e) {
		CPArtwork artwork = controller.getArtwork();
		Object source = e.getItemSelectable();
		if (source == cbSampleAllLayers) {
			artwork.setSampleAllLayers(e.getStateChange() == ItemEvent.SELECTED);
		} else if (source == cbLockAlpha) {
			artwork.setLockAlpha(e.getStateChange() == ItemEvent.SELECTED);
		}
	}