private void PretraziDodatnuUslugu()
        {
            string searchQuery = tbPretrazi.Text;

            view = CollectionViewSource.GetDefaultView(DodatnaUsluga.Pretrazi(cbSortiranje.SelectedItem.ToString(), searchQuery));
            dgNamestaj.ItemsSource = DodatnaUsluga.Pretrazi((cbSortiranje.SelectedItem.ToString()), searchQuery);
            dgNamestaj.IsSynchronizedWithCurrentItem = true;
        }