private void CursorAction(object sender, RoutedEventArgs e)
        {
            Button      button    = sender as Button;
            bool        toRight   = Convert.ToBoolean(button.Tag.ToString());
            List <char> inputList = new List <char> {
            };
            string input          = resultLabel.Content.ToString();

            foreach (var c in input)
            {
                inputList.Add(c);
            }

            if (!inputList.Contains('|'))
            {
                if (!toRight)
                {
                    inputList.Insert(inputList.Count() - 1, '|');
                }
            }
            else
            {
                inputList.MoveCursor(toRight);
            }
            resultLabel.Content = inputList.GetLabel();
        }