pack cells vertically

[control H <control h gmail com>]

Hi all,

I've made some treeview and I want to pack some cellrenderers vertically
into GtkCellLayout. Thus, I'm looking for some anologue of
gtk_cell_layout_pack_end and friends, but in vertical direction.
Is that possible? Or is it possible to merge two adjecent rows into one?

I've also been trying iconview things, but that's not exactly what
I want.

Thanks for your help.