private void btnExportDocument_Click(object sender, EventArgs e)
{
string fileName = this.Text;
string documentDir = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
string data = atmlPreviewPanel.Text;
if (!string.IsNullOrWhiteSpace( data ))
FileManager.WriteFile(Encoding.UTF8.GetBytes(data), Path.Combine(documentDir, fileName));
}