public class BasicEntryPoint extends AbstractEntryPoint {

    @Override
    protected void createContents(Composite parent) {
        final Tree tree = new Tree(parent, SWT.BORDER);
        TreeItem item1 = new TreeItem(tree, SWT.NONE);
        item1.setText("Item 1");
        TreeItem item2 = new TreeItem(item1, SWT.NONE);
        item2.setText("Item 2");
        tree.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event event) {
				System.out.println("Selection event " + event.item);
			}
		});
        tree.setLayoutData(new GridData(150, 150));
        Button button = new Button(parent, SWT.PUSH);
        button.setText("Print Selection");
        button.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event event) {
				System.out.println("Tree selection: " + Arrays.toString(tree.getSelection()));
			}
		});
  	}
}