TreeModel selected row number

[John Taber <jtaber johntaber net>]

I cannot seem to figure out how to get the selected row number in a tree 
model.  I am following the example framework and have:

Gtk::TreeModel::iterator iter = m_refTreeModel->get_iter(path);
if(iter) {Gtk::TreeModel::Row row = *iter;}

this gives me the "Row" and I can get any member of that row and I guess I 
could use a member value and iterate thru the data to find the row number but 
that seems the hard way - what am I missing ?  
thks
John