}
@Override
public void contributeToToolBar(IToolBarManager toolBarManager) {
occurrencesAction = new ToggleMarkOccurrencesAction();
layoutAction = new ToggleLayoutAction();
zoomCombo = new MultiPageZoomComboContributionItem(getPage());
toolBarManager.add(new GroupMarker(ID_GROUP));
toolBarManager.appendToGroup(ID_GROUP, occurrencesAction);
toolBarManager.appendToGroup(ID_GROUP, layoutAction);
toolBarManager.appendToGroup(ID_GROUP, zoomCombo);