public void createPageControls(Composite pageContainer) {
super.createPageControls(pageContainer);
// TODO avoid reflection
try {
IWizardPage[] pages = getPages();
PreviewWizardPage pvp = ((PreviewWizardPage) pages[pages.length-1]);
Field treeViewerField = pvp.getClass().getDeclaredField("fTreeViewer");
treeViewerField.setAccessible(true);
TreeViewer treeViewer = (TreeViewer) treeViewerField.get(pvp);
treeViewer.setLabelProvider(new ChangeElementLabelProvider());
treeViewer.refresh(true);
} catch (Exception e) {