/* Set a tooltip on the column */
column = gtk_tree_view_get_column (GTK_TREE_VIEW (tree_view), 0);
gtk_tree_view_column_set_clickable (column, TRUE);
/* Set a tooltip on the column */
column = gtk_tree_view_get_column (GTK_TREE_VIEW (tree_view), 0);
gtk_tree_view_column_set_clickable (column, TRUE);