private void moduleButton_Click(object sender, EventArgs e)
        {
            crosslinkPanel.Visible = true;
            hyperlinkPanel.Visible = false;
            linkTarget = Enums.LinkTarget.TrainingModule;

            ClearList();
            CheckState();
            FillList();
        }
        private void bookmarkButton_Click(object sender, EventArgs e)
        {
            crosslinkPanel.Visible = true;
            hyperlinkPanel.Visible = false;
            linkTarget = Enums.LinkTarget.Bookmark;

            ClearList();
            CheckState();
            FillList();
        }
        private void externalConceptButton_Click(object sender, EventArgs e)
        {
            crosslinkPanel.Visible = true;
            hyperlinkPanel.Visible = false;
            linkTarget = Enums.LinkTarget.ExternalConcept;

            ClearList();
            CheckState();
            FillList();
        }
        public void InitializeDialog()
        {
            DataTransferUnit = new XmlHelper();
            DataTransferUnit.AppendNode(string.Empty, "Data");
            DataTransferUnit.AppendNode("Data", "LinkText");
            DataTransferUnit.AppendNode("Data", "LinkObjectId");
            DataTransferUnit.AppendNode("Data", "LinkTarget");
            DataTransferUnit.AppendNode("Data", "Url");

            linkTarget = Enums.LinkTarget.Bookmark;
            HelpKeyword = "Ссылка";
            linkTextTextBox.Select();
            FillList();
            linkTypeComboBox.SelectedIndexChanged += linkTypeComboBox_SelectedIndexChanged;
            urlTextBox.Text = "http://";
            linkTypeComboBox.Text = "http:";
        }
        private void hyperlinkButton_Click(object sender, EventArgs e)
        {
            hyperlinkPanel.Visible = true;
            crosslinkPanel.Visible = false;
            linkTarget = Enums.LinkTarget.Hyperlink;

            ClearList();
            CheckState();
        }