_edit_screen->Enable (ss);
_remove_screen->Enable (ss);
- wxButton* ok = dynamic_cast<wxButton *> (FindWindowById (wxID_OK));
+ wxButton* ok = dynamic_cast<wxButton *> (FindWindowById (wxID_OK, this));
if (ok) {
ok->Enable ((selected_cinemas().size() > 0 || selected_screens().size() > 0) && sd);
}