/// <summary>
        /// Invoked when the "New timer" <see cref="MenuItem"/> is clicked.
        /// </summary>
        /// <param name="sender">The <see cref="MenuItem"/> where the event handler is attached.</param>
        /// <param name="e">The event data.</param>
        private void NewTimerMenuItemClick(object sender, EventArgs e)
        {
            TimerWindow window = new TimerWindow();

            window.RestoreFromSibling();
            window.Show();
        }
        /// <summary>
        /// Invoked when the "New timer" <see cref="MenuItem"/> is clicked.
        /// </summary>
        /// <param name="sender">The <see cref="MenuItem"/> where the event handler is attached.</param>
        /// <param name="e">The event data.</param>
        private void NewTimerMenuItemClick(object sender, RoutedEventArgs e)
        {
            TimerWindow window = new TimerWindow();

            window.RestoreFromWindow(this.timerWindow);
            window.Show();
        }