submenuManager.add(new Separator("additions-end"));
// Prepare for CreateChild item addition or removal.
//
createChildMenuManager = new MenuManager(OntoUMLEditorPlugin.INSTANCE.getString("_UI_CreateChild_menu_item"));
submenuManager.insertBefore("additions", createChildMenuManager);
// Prepare for CreateSibling item addition or removal.
//
createSiblingMenuManager = new MenuManager(OntoUMLEditorPlugin.INSTANCE.getString("_UI_CreateSibling_menu_item"));
submenuManager.insertBefore("additions", createSiblingMenuManager);