private void SearchClick(object sender, RoutedEventArgs e)
 {
     HeaderPanel.Visibility = Visibility.Collapsed;
     FilterTb.Visibility    = Visibility.Visible;
     FilterTb.Focus(FocusState.Programmatic);
 }
 private void SearchClick(object sender, EventArgs e)
 {
     HeaderPanel.Visibility = Visibility.Collapsed;
     FilterTb.Visibility    = Visibility.Visible;
     FilterTb.Focus();
 }