MenuItem(Menu parent, Menu menu, int style, int index) {
   super(parent, checkStyle(style));
   this.parent = parent;
   this.menu = menu;
   this.index = index;
   if (menu != null) menu.cascade = this;
   display.addMenuItem(this);
 }
  void setMenu(Menu menu, boolean dispose) {

    /* Assign the new menu */
    Menu oldMenu = this.menu;
    if (oldMenu == menu) return;
    if (oldMenu != null) oldMenu.cascade = null;
    this.menu = menu;

    /* Assign the new menu in the OS */
    if ((OS.IsPPC || OS.IsSP) && parent.hwndCB != 0) {
      if (OS.IsPPC) {
        long /*int*/ hwndCB = parent.hwndCB;
        long /*int*/ hMenu = menu == null ? 0 : menu.handle;
        OS.SendMessage(hwndCB, OS.SHCMBM_SETSUBMENU, id, hMenu);
      }
      if (OS.IsSP) error(SWT.ERROR_CANNOT_SET_MENU);
    } else {
      long /*int*/ hMenu = parent.handle;
      MENUITEMINFO info = new MENUITEMINFO();
      info.cbSize = MENUITEMINFO.sizeof;
      info.fMask = OS.MIIM_DATA;
      int index = 0;
      while (OS.GetMenuItemInfo(hMenu, index, true, info)) {
        if (info.dwItemData == id) break;
        index++;
      }
      if (info.dwItemData != id) return;
      int cch = 128;
      long /*int*/ hHeap = OS.GetProcessHeap();
      int byteCount = cch * TCHAR.sizeof;
      long /*int*/ pszText = OS.HeapAlloc(hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
      info.fMask = OS.MIIM_STATE | OS.MIIM_ID | OS.MIIM_DATA;
      /*
       * Bug in Windows.  When GetMenuItemInfo() is used to get the text,
       * for an item that has a bitmap set using MIIM_BITMAP, the text is
       * not returned.  This means that when SetMenuItemInfo() is used to
       * set the submenu and the current menu state, the text is lost.
       * The fix is use MIIM_BITMAP and MIIM_STRING.
       */
      if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION(4, 10)) {
        info.fMask |= OS.MIIM_BITMAP | OS.MIIM_STRING;
      } else {
        info.fMask |= OS.MIIM_TYPE;
      }
      info.dwTypeData = pszText;
      info.cch = cch;
      boolean success = OS.GetMenuItemInfo(hMenu, index, true, info);
      if (menu != null) {
        menu.cascade = this;
        info.fMask |= OS.MIIM_SUBMENU;
        info.hSubMenu = menu.handle;
      }
      if (OS.IsWinCE) {
        OS.RemoveMenu(hMenu, index, OS.MF_BYPOSITION);
        /*
         * On WinCE, InsertMenuItem() is not available.  The fix is to
         * use SetMenuItemInfo() but this call does not set the menu item
         * state and submenu.  The fix is to use InsertMenu() to insert
         * the item, SetMenuItemInfo() to set the string and EnableMenuItem()
         * and CheckMenuItem() to set the state.
         */
        long /*int*/ uIDNewItem = id;
        int uFlags = OS.MF_BYPOSITION;
        if (menu != null) {
          uFlags |= OS.MF_POPUP;
          uIDNewItem = menu.handle;
        }
        TCHAR lpNewItem = new TCHAR(0, " ", true);
        success = OS.InsertMenu(hMenu, index, uFlags, uIDNewItem, lpNewItem);
        if (success) {
          info.fMask = OS.MIIM_DATA | OS.MIIM_TYPE;
          success = OS.SetMenuItemInfo(hMenu, index, true, info);
          if ((info.fState & (OS.MFS_DISABLED | OS.MFS_GRAYED)) != 0) {
            OS.EnableMenuItem(hMenu, index, OS.MF_BYPOSITION | OS.MF_GRAYED);
          }
          if ((info.fState & OS.MFS_CHECKED) != 0) {
            OS.CheckMenuItem(hMenu, index, OS.MF_BYPOSITION | OS.MF_CHECKED);
          }
        }
      } else {
        if (dispose || oldMenu == null) {
          success = OS.SetMenuItemInfo(hMenu, index, true, info);
        } else {
          /*
           * Feature in Windows.  When SetMenuItemInfo () is used to
           * set a submenu and the menu item already has a submenu,
           * Windows destroys the previous menu.  This is undocumented
           * and unexpected but not necessarily wrong.  The fix is to
           * remove the item with RemoveMenu () which does not destroy
           * the submenu and then insert the item with InsertMenuItem ().
           */
          OS.RemoveMenu(hMenu, index, OS.MF_BYPOSITION);
          success = OS.InsertMenuItem(hMenu, index, true, info);
        }
      }
      if (pszText != 0) OS.HeapFree(hHeap, 0, pszText);
      if (!success) {
        int error = OS.GetLastError();
        SWT.error(
            SWT.ERROR_CANNOT_SET_MENU,
            null,
            " [GetLastError=0x" + Integer.toHexString(error) + "]"); // $NON-NLS-1$ $NON-NLS-2$
      }
    }
    parent.destroyAccelerators();
  }