public static boolean processAddition(
     final MMenu menuModel,
     final ArrayList<MMenuElement> menuContributionsToRemove,
     MMenuContribution menuContribution,
     final HashSet<String> existingMenuIds,
     HashSet<String> existingSeparatorNames) {
   int idx = getIndex(menuModel, menuContribution.getPositionInParent());
   if (idx == -1) {
     return false;
   }
   for (MMenuElement item : menuContribution.getChildren()) {
     if (item instanceof MMenu && existingMenuIds.contains(item.getElementId())) {
       // skip this, it's already there
       continue;
     } else if (item instanceof MMenuSeparator
         && existingSeparatorNames.contains(item.getElementId())) {
       // skip this, it's already there
       continue;
     }
     MMenuElement copy = (MMenuElement) EcoreUtil.copy((EObject) item);
     if (DEBUG) {
       trace("addMenuContribution " + copy, menuModel.getWidget(), menuModel); // $NON-NLS-1$
     }
     menuContributionsToRemove.add(copy);
     menuModel.getChildren().add(idx++, copy);
     if (copy instanceof MMenu && copy.getElementId() != null) {
       existingMenuIds.add(copy.getElementId());
     } else if (copy instanceof MMenuSeparator && copy.getElementId() != null) {
       existingSeparatorNames.add(copy.getElementId());
     }
   }
   return true;
 }
  private void showStandaloneViewMenu(
      ExecutionEvent event, MPart model, MMenu menuModel, Composite partContainer) {
    Shell shell = partContainer.getShell();
    Menu menu = (Menu) menuModel.getWidget();
    if (menu == null) {
      IPresentationEngine engine =
          (IPresentationEngine) HandlerUtil.getVariable(event, IPresentationEngine.class.getName());
      menu = (Menu) engine.createGui(menuModel, shell, model.getContext());
      if (menu != null) {
        final Menu tmpMenu = menu;
        partContainer.addDisposeListener(
            new DisposeListener() {
              public void widgetDisposed(DisposeEvent e) {
                tmpMenu.dispose();
              }
            });
      }
    }

    Display display = menu.getDisplay();
    Point location = display.map(partContainer, null, partContainer.getLocation());
    Point size = partContainer.getSize();
    menu.setLocation(location.x + size.x, location.y);
    menu.setVisible(true);

    while (!menu.isDisposed() && menu.isVisible()) {
      if (!display.readAndDispatch()) display.sleep();
    }

    if (!(menu.getData() instanceof MenuManager)) {
      menu.dispose();
    }
  }