* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#createMenuContributions(org.eclipse.jface.viewers.TreeViewer)
*/
protected IContributionItem[] createMenuContributions(TreeViewer viewer) {
IContributionItem[] items;
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
IContributionItem showAttributeItem = new PropertyChangeUpdateActionContributionItem(new ToggleShowAttributeAction(getPreferenceStore(), OUTLINE_SHOW_ATTRIBUTE_PREF, viewer));
items = super.createMenuContributions(viewer);
if (items == null) {
items = new IContributionItem[]{showAttributeItem};
}