/// <summary>
        /// The ManageTopics
        /// </summary>
        private void ManageTopics()
        {
            var topicsDialog = new TopicsDialog(Corpus.Topics);

            if (topicsDialog.ShowDialog().Equals(DialogResult.OK))
            {
                Corpus.Topics = topicsDialog.Topics;
            }
        }
        /// <summary>
        /// The button4_Click
        /// </summary>
        /// <param name="sender">The sender<see cref="object"/></param>
        /// <param name="e">The e<see cref="EventArgs"/></param>
        private void button4_Click(object sender, EventArgs e)
        {
            var d = new TopicsDialog(Topics);

            if (d.ShowDialog().Equals(DialogResult.OK))
            {
                Topics = d.Topics;
                PopulateTopicsListView(Topics);
                changeDetector1.Changed = true;
            }
        }