///
/// <param name="osoba"></param>
/// <param name="trening"></param>
/// <param name="service"></param>
public string DeleteTrening(Osoba osoba, Trening trening, IDBService service){
string message = "";
undoRedo.InsertInUnDoRedoForDelete(osoba, service, trening, out message);
return message;
//return service.DeleteTrening(osoba, trening);
}
