protected Component headerPanel() {
Fragment header = new Fragment(HEADER_PANEL, "header", this);
// the add button
header.add(new BookmarkablePageLink("addNew", NewServiceAccessRulePage.class));
// the removal button
header.add(removal = new SelectionServiceRemovalLink("removeSelected", rules, dialog));
removal.setOutputMarkupId(true);
removal.setEnabled(false);