{
wxCHECK_MSG(!(GetWindowStyle() & wxCB_SORT), -1, wxT("can't insert into choice"));
wxCHECK_MSG(IsValidInsert(pos), -1, wxT("invalid index"));
{
wxCHECK_MSG(!(GetWindowStyle() & wxCB_SORT), -1, wxT("can't insert into choice"));
wxCHECK_MSG(IsValidInsert(pos), -1, wxT("invalid index"));