[Gtk-sharp-list] ComboBox problem

[doza]

Hello

I have two-level tree store, first level is made of two fixed nodes.
it goes like this:

CategoryA
	Node1
	Node2
	...
CategoryB
	Node1
	Node2
	...

I would like to make ComboBox of this store and only allow to select
second level items. Categories don't need to be displayed.
I have tried ComboBox.RowSeparatorFunc, but if category are hidden, it's
items are hidden too. Additionally, this function seems to be called
only for categories.
Am I missing something, or should I create separate store for ComboBox?

-- 
Dominik Zablotny
xmpp:doza at sztorm.net