How can I refresh sorting rules?

I have a GtkTreeView. I call gtk_tree_sortable_set_default_sort_func()
with some function and then
Sorting works well, but some time later I want to change sorting
function to some other one. But calling ...set_default_sort_func again
doesn't force the model to re-sort its data. How can I force it to do

struct Sig {
  string name("     J a r e k   D u k a t     ");
  string mail(" madmaxer (at) poczta (dot) fm ");

Aaaaaaaaaaa, fantastyczny sprzet DVD do wygrania!!!

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