Popup menu selections

I have a series of menus that are dynamically built so I can alter the contents based on whether certain items

are present. When one of these menu items is selected, I need to know which one.

I build the menu, and sub-menu in the same way:

void CMyTree::BuildMenus()

{

.....

pSubMenu->items().push_back(Gtk::Menu_Helpers::MenuElem::MenuElem(pDropIn->GetDisplayString(),

SigC::slot(*this, &CMyTreeView::on_popup);

......

// pop the menu up....

}

void CMyTreeView::on_popup()

{

//do whatever is needed.

}

My issue is that the sub-menu can have any number of options, depending on what dropins I have in the system.

There is no good way to have a call back per drop in, because I will not know what dropins are there, or how many

might be there (drop ins are dynamically loaded at startup time).

I tried to have the call back for the menu item be a method of the "pDropIn" class, but the compiler was not happy

with anything like: SigC::slot(*this, pDropIn->PopUPCallback() ) ( I tried several variations wiht &, * and other items.)

Is there a way to either:

- attach some "marker" or "tag" to each menu item, so I can figure out what is selected?

- redirect the menu callback into an instantiated virtual class via a ptr to the base class?

I saw a "get_active" method in the menu documentation, it seems to return a Menu Item, but the online documnetation

is very weak with telling you what the methods actually do.

Thanks for any help.

--Bob