public class MyComposite extends Composite {

	public MyComposite(Composite parent, int style) {
		super(parent, style);

		createContents();
	}

	private void createContents() {
		Button btnNewButton = new Button(this, SWT.NONE);
		btnNewButton.setBounds(0, 0, 91, 29);
		btnNewButton.setText("New Button");
	}

	@Override
	protected void checkSubclass() {
		// Disable the check that prevents subclassing of SWT components
	}
}

public class MyComposite extends Composite {

	@Inject
	private IEclipseContext context;

	public MyComposite(Composite parent, int style) {
		super(parent, style);
	}

	@PostConstruct
	private void createContents() {
		Text text = new Text(this, SWT.BORDER);
		text.setText(".....");
                
		// here I'm able to use the context
	}
}

if (java.beans.Beans.isDesignTime()) this.createContents();