/**
   * Determines if the selection was on the dropdown affordance and, if so, opens the drop down menu
   * (populated using the same id as this item...
   *
   * @param event The <code>SWT.Selection</code> event to be tested
   * @return <code>true</code> iff a drop down menu was opened
   */
  private boolean openDropDownMenu(Event event) {
    Widget item = event.widget;
    if (item != null) {
      int style = item.getStyle();
      if ((style & SWT.DROP_DOWN) != 0) {
        if (event.detail == 4) { // on drop-down button
          ToolItem ti = (ToolItem) item;

          final MenuManager menuManager = new MenuManager();
          Menu menu = menuManager.createContextMenu(ti.getParent());
          menuManager.addMenuListener(
              new IMenuListener() {
                public void menuAboutToShow(IMenuManager manager) {
                  String id = getId();
                  if (dropDownMenuOverride != null) {
                    id = dropDownMenuOverride;
                  }
                  menuService.populateContributionManager(menuManager, "menu:" + id); // $NON-NLS-1$
                }
              });
          // position the menu below the drop down item
          Rectangle b = ti.getBounds();
          Point p = ti.getParent().toDisplay(new Point(b.x, b.y + b.height));
          menu.setLocation(p.x, p.y); // waiting for SWT
          // 0.42
          menu.setVisible(true);
          return true; // we don't fire the action
        }
      }
    }

    return false;
  }
 public Menu getMenu(Control parent) {
   if (lastMenu != null) {
     lastMenu.dispose();
   }
   lastMenu = new Menu(parent);
   createEntries(lastMenu);
   return lastMenu;
 }
 public void dispose() {
   if (lastMenu != null) {
     lastMenu.dispose();
     lastMenu = null;
   }
 }