/*
   * (non-Javadoc)
   *
   * @see
   * org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands
   * .ExecutionEvent)
   */
  public Object execute(ExecutionEvent event) throws ExecutionException {
    IWorkbenchPart part = HandlerUtil.getActivePart(event);
    if (part != null) {
      IWorkbenchPartSite site = part.getSite();
      if (site instanceof PartSite) {
        final MPart model = ((PartSite) site).getModel();
        Composite partContainer = (Composite) model.getWidget();
        if (partContainer != null) {
          Composite parent = partContainer.getParent();
          while (parent != null && parent instanceof Composite) {
            if (parent instanceof CTabFolder) {
              CTabFolder ctf = (CTabFolder) parent;
              final Control topRight = ctf.getTopRight();
              if (topRight instanceof Composite) {
                for (Control child : ((Composite) topRight).getChildren()) {
                  if (child instanceof ToolBar
                      && "ViewMenu".equals(child.getData())) { // $NON-NLS-1$
                    ToolBar tb = (ToolBar) child;
                    ToolItem ti = tb.getItem(0);
                    Event sevent = new Event();
                    sevent.type = SWT.Selection;
                    sevent.widget = ti;
                    ti.notifyListeners(SWT.Selection, sevent);
                  }
                }
              }
              return null;
            }
            parent = parent.getParent();
          }

          MMenu menuModel = StackRenderer.getViewMenu(model);
          if (menuModel != null) {
            showStandaloneViewMenu(event, model, menuModel, partContainer);
          }
        }
      }
    }
    return null;
  }