public class TestCTabFolder {
	
	private CTabFolder tabFolder;

	public void run() {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setText("Show CTabFolder");
		createContents(shell);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
		display.dispose();
	}
	
	private void createContents(Shell shell) {
	    shell.setLayout(new GridLayout(1, true));

	    // Create the tabs
	    tabFolder = new CTabFolder(shell, SWT.TOP);
	    tabFolder.setBorderVisible(true);
	    tabFolder.setLayoutData(new GridData(GridData.FILL_BOTH));
		tabFolder.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				tabFolder.getSelection().notifyListeners(SWT.SELECTED, new Event());
			}
		});

		CTabItem firstTab = addTab("tab1");
		addTab("tab2");
		addTab("tab3");
		
		tabFolder.setSelection(firstTab);
	}

	private CTabItem addTab(String title) {
		CTabItem tabItem = new CTabItem(tabFolder, SWT.NONE);
		tabItem.setText(title);
		
		final ScrolledComposite scrolledComp = new ScrolledComposite(tabFolder, SWT.V_SCROLL);
		final Composite comp = new Composite(scrolledComp, SWT.NONE);
		scrolledComp.setContent(comp);
		comp.setLayout(new GridLayout(1, true));
		comp.setLayoutData(new GridData(GridData.FILL_BOTH));
		
		for (int i = 0; i < 30; i++) {
			Label label = new Label(comp, SWT.NONE);
			label.setText(title + ": label" + i);
		}
		
		scrolledComp.setExpandVertical(true);
		scrolledComp.setExpandHorizontal(true);
		scrolledComp.setMinSize(comp.computeSize(SWT.DEFAULT, SWT.DEFAULT));
		
		tabItem.setControl(scrolledComp);
		tabItem.addListener(SWT.SELECTED, new Listener() {
			@Override
			public void handleEvent(Event event) {
				scrolledComp.layout(true);
			}
		});
		return tabItem;
	}
	
	public static void main(String[] args) {
		new TestCTabFolder().run();
	}
}

scrolledComp.layout(true);

tabFolder.layout(true);