[Gtk-sharp-list] ComboBox: How to add arow that is not in the model?

[xat]

Hello,

I have a combobox that work with a TreeModel. 
It works OK but I want to add rows that are not in the TreeModel (such as:
"None" or "Create New"  or a simple separator)

I tried the Add method but it does not have the desored effect.

Is this possible somehow?
thanks

xavier
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