public UsingExposedForExtending(Composite parent, int style)
    {
        super(parent, style);
        setLayout(new GridLayout(1, false));
        
        exposedForExtending = new ExposedForExtending(this, SWT.NONE);

public class ExposedForExtending extends Composite {
	private DataBindingContext m_bindingContext;
	private Binding mBinding;
	private Text text;
	private Composite composite;

	...
public ExposedForExtending(Composite parent, int style) {
		super(parent, style);
		setLayout(new GridLayout(1, false));
...
protected DataBindingContext initDataBindings() {
        DataBindingContext bindingContext = new DataBindingContext();
 ...