private void btnDelTracServer_Click(object sender, EventArgs e)
        {
            ServerNode node = treeTrac.SelectedNode as ServerNode;

            if (MessageBox.Show(string.Format(Properties.Resources.ConfirmDelTracServer, node.ServerDetails.Server), Properties.Resources.CaptionConfirmDelete, MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                CommonRoot.Instance.Servers.Remove(node.ServerDetails);
                CommonRoot.SaveInstance();
                node.Remove();
            }
        }