Access items in popupmenu for BarButtonItem, devXpress, winforms

Question

I am new to devxpress. I use a BarManager, on witch I add BarButtonItems at runtime. The BarButtonItem has a PopupMenu witch contains BarButtonItems.

I need to populate a TreeList with the buttons hierarchy. I can access the buttons on the bar, but how to access the buttons on the popup for that button on bar?

To add buttons on bar I use:

bar2.LinksPersistInfo.Add(new LinkPersistInfo(toolStripMenuItem));

To add buttons on popup I use:

popupSubMenu.ItemLinks.Add(toolStripSubMenuItem);

To add popoup to button I use:

toolStripMenuItem.ActAsDropDown = true;
toolStripMenuItem.ButtonStyle = BarButtonStyle.DropDown;
toolStripMenuItem.DropDownControl = popupSubMenu;