[Gtk-sharp-list] Not underline Treeview column title

[lordphoenix]

Hi 
I have treeview column name wiht an "_".
I should like that column appears as is without next characters
after "_" be underline.

Someone know how I can do this?

PS : Sorry for my bad English I don't speak it very often (If I make
very big mistake please say it so I will learn..)
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