wxCHECK_MSG(!(GetWindowStyle() & wxCB_SORT), -1, wxT("can't insert into choice"));
wxCHECK_MSG((pos>=0) && (pos<=GetCount()), -1, wxT("invalid index"));
wxCHECK_MSG(!(GetWindowStyle() & wxCB_SORT), -1, wxT("can't insert into choice"));
wxCHECK_MSG((pos>=0) && (pos<=GetCount()), -1, wxT("invalid index"));