code: func (v *TreeStore) SetSortColumnId(column int, order SortType) {
  	sort := C.toGtkTreeSortable(unsafe.Pointer(v.Native()))
  	C.gtk_tree_sortable_set_sort_column_id(sort, C.gint(column), C.GtkSortType(order))
  }
docs: // SetSortColumnId() is a wrapper around gtk_tree_sortable_set_sort_column_id().