void gtk_tree_view_set_search_column ( GtkTreeView* tree_view, int column )
column as the column where the interactive search code should
search in for the current model.
If the search column is set, users can use the “start-interactive-search” key binding to bring up search popup. The enable-search property controls whether simply typing text will also start an interactive search.
column refers to a column of the current model. The search
column is reset to -1 when the model is changed.