// - kontruktor przeciążony (wskazanie na rodzica)
 public ItemOleDbManager(OleDbManager aManager, ItemOleDbManager aOwner)
 {
     this.ParentMenager = aManager;
     this.Owner         = aOwner;
 }
 // - konstruktor
 public ItemOleDbManager(OleDbManager aManager)
 {
     this.ParentMenager = aManager;
 }