can i hide/show rows of Gtk2 Treeviews?

[fritzsch <fritzsch cip physik uni-muenchen de>]

hi
i am just collecting my first experiences with the new gtk2
treeviews and came across this question.
i want to have a filter, where i can hide some rows of a treeview.
can i hide them, or do i really have to remove them?
with columns this seems to be very easy...
greets,
Patrick

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