private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            SectorViewModel sector = new SectorViewModel();

            sector.Identifier = Guid.NewGuid();

            Sector_AddEdit addEditForm = new Sector_AddEdit(sector, true);

            addEditForm.SectorCreatedUpdated += new SectorHandler(SyncData);
            FlyoutHelper.OpenFlyout(this, ((string)Application.Current.FindResource("Podaci_o_sektrorima")), 95, addEditForm);
        }
        private void btnEdit_Click(object sender, RoutedEventArgs e)
        {
            if (CurrentSector == null)
            {
                MainWindow.WarningMessage = ((string)Application.Current.FindResource("Morate_odabrati_sektor_za_izmenuUzvičnik"));
                return;
            }

            Sector_AddEdit addEditForm = new Sector_AddEdit(CurrentSector, false);

            addEditForm.SectorCreatedUpdated += new SectorHandler(SyncData);
            FlyoutHelper.OpenFlyout(this, ((string)Application.Current.FindResource("Podaci_o_sektrorima")), 95, addEditForm);
        }