private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            VulDeGrid();
            TextBoxZoeken.Focus();
            var manager = new BrouwerManager();

            ComboBoxPostcodeFilter.Items.Add("alles");
            List <String> pc = manager.getPostcodes();

            foreach (var p in pc)
            {
                ComboBoxPostcodeFilter.Items.Add(p);
            }
            ComboBoxPostcodeFilter.SelectedIndex = 0;
        }
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            //System.Windows.Data.CollectionViewSource brouwerViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("brouwerViewSource")));

            VulDeGrid();

            //var manager = new BrouwerManager();



            //brouwersOb = manager.BrouwersMetBeginLetters(TextBoxZoeken.Text);



            //brouwerViewSource.Source = brouwersOb;

            TextBoxZoeken.Focus();
        }