ComboBox: selecting items with children, Gtk2 vs Gtk3

[Eduardo M KALINOWSKI <eduardo kalinowski com br>]

Consider the sample attached: it builds a tree model with an item that  
has child items, and uses that model in a ComboBox.

When compiled with Gtk2, when the item with children is selected and  
its children displayed, and extra item representing the parent is  
added to the top, allowing the parent to be selected. The attached  
image should make that clearer.

However, compiled with Gtk3, that item that allows selection of the  
parent is missing, as the other image shows.

So how does one select "Item with children", using the mouse, under  
Gtk3? The item can be selected using the keyboard, but apparently with  
the mouse. Is there a way to get the Gtk2 behaviour back with Gtk3?


Thanks,
--
Eduardo M KALINOWSKI
eduardo kalinowski com br