getting images inside a combobox

[Rob Benton <rob benton conwaycorp net>]

I was checking out the section in the Gtkmm book on comboboxes:

http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/ch06s03.html

In the example I see that on the dropdown list there's an image in 
there.  But if you select the image it does not become "active".  Is 
there a way to make images active in some type of combobox?