I answered you on the list. Quick version: when you turn on "has-tip", gtk+ will create the tooltip and ask you to set it up and whether to show it in the "query-tooltip" signal.

In reply to Re: Gtk2 Treeview/Simplelist and set_tooltip_row() by muppet
in thread Gtk2 Treeview/Simplelist and set_tooltip_row() by jettero

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