viewer.setConnectionStyle(ZestStyles.CONNECTIONS_DOT);

	public void createPartControl(Composite parent) {
		viewer = new GraphViewer(parent, SWT.BORDER);
		viewer.setContentProvider(new GNodeContentProvider());
		viewer.setLabelProvider(new GLabelProvider());
		GNodeModelProvider model = new GNodeModelProvider();
		viewer.setInput(model.getNodes());
		LayoutAlgorithm layout = setLayout();
		viewer.setLayoutAlgorithm(layout, true);
		viewer.applyLayout();
		viewer.setConnectionStyle(ZestStyles.CONNECTIONS_DOT);

	}