[gtkmm] My own image in toolbar

["Christophe Piault" <krispyro wanadoo fr>]

Hi!

I'd like to use my own icon in a Toolbar button.
I faced the same problem for menu and had to use ImageMenuElem.
But there is no ImageElem in the Gtk::Toolbar_Helpers.
The only solution I see now is to add StockItem in Gtk::Stock but I don't know how to do.

Thank you very much for any help