private void HandleKeyDown([NotNull] object sender, [NotNull] KeyEventArgs e)
{
Debug.ArgumentNotNull(sender, nameof(sender));
Debug.ArgumentNotNull(e, nameof(e));
if (e.Key != Key.Delete)
{
return;
}
var selectedItems = Validators.SelectedItems.OfType <ListBoxItem>().Select(listBoxItem => listBoxItem.Tag).OfType <TemplateHeader>().Select(templateHeader => templateHeader.TemplateId).ToList();
foreach (var selectedItem in selectedItems)
{
ValidatorPicker.Remove(selectedItem);
}
}
