private void Scanner_ItemAdded(object sender, ItemAddedEventArg e)
 {
     this.Invoke(new MethodInvoker(() =>
     {
         mmAddItems.Text          += e.Item.UA + Environment.NewLine;
         mmAddItems.SelectionStart = mmAddItems.Text.Length;
         mmAddItems.ScrollToCaret();
         listUA.Add(e.Item);
     }));
 }
 protected virtual void OnItemAdded(ItemAddedEventArg e)
 {
     ItemAdded?.Invoke(this, e);
 }