public NarudzbeNodeStore(bool loadFromDB) : base(typeof(NarudzbeNode))
 {
     if (loadFromDB)
     {
         this.AddList(DBNarudzba.GetNarudzbe());
     }
 }
 public void Refresh()
 {
     Clear();
     AddList(DBNarudzba.GetNarudzbe());
 }