Add menu item between the classical menu items

When I load my plugin within Acrobat I create a new menu item that it's passed at the end of existing items, back to Help item.

I would like to move it to the left, between View and Window if possible.

  AVMenubar menubar = AVAppGetMenubar();

  AVMenu viewMenu = AVMenubarAcquireMenuByName(menubar, "View");

  AVMenuIndex indexMenu =  AVMenubarGetMenuIndex(menubar, viewMenu);

  // Create our menu item

  stMenuItem = AVMenuItemNew(MyMenuItemTitle, MyMenuItemName, NULL, true, NO_SHORTCUT, 0, NULL, gExtensionID);

  // ....

  commonMenu = AVMenubarAcquireMenuByName(menubar, "MYPREFIX:MYID");

  if (!commonMenu) {

      commonMenu = AVMenuNew("Menu Item Name", "MYPREFIX:MYID", gExtensionID);

      AVMenubarAddMenu(menubar, commonMenu, APPEND_MENU);

  }

  AVMenuAddMenuItem(commonMenu, stMenuItem, 3/*indexMenu*//*APPEND_MENUITEM*/);

But whatever index I pass to AVMenuAddMenuItem() I get my menu item to the end. I was thinking I might need to change the index of those back items, but I didn't find a *SetIndex function.