public class ScrolledCompositeExample {
  public static void main(String[] args) {
	final int MIN_HEIGHT = 100;
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    
    Button button = new Button(shell, SWT.PUSH);
    button.setText("add another button");
    
    final ScrolledComposite sc = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL);
    final Composite childComposite = new Composite(sc, SWT.NONE);
    childComposite.setLayout(new FillLayout(SWT.VERTICAL));

    new Button(childComposite, SWT.PUSH | SWT.BORDER).setText("button");
                                        
    sc.setContent(childComposite);
    sc.setMinSize(300, MIN_HEIGHT);
    sc.setExpandHorizontal(true);
    sc.setExpandVertical(true);

    button.addSelectionListener(new SelectionAdapter() {
    	public void widgetSelected(SelectionEvent e) {
    		new Button(childComposite, SWT.PUSH | SWT.BORDER).setText("button");
    		int height = childComposite.getChildren().length * MIN_HEIGHT;
    		sc.setMinHeight(height);
    		childComposite.layout(false);
    	}
	});
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}