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;
}