title: FastReport export to image in multipage reports
body: <p>I want to export a multi page report (FastReport) to image </p>
  
  <pre><code>var stream = new MemoryStream();
  rpt.Export(new ImageExport(), result);
  </code></pre>
  
  <p>reports with one page is OK, but multipage reports have this error :</p>
  
  <blockquote>
    <p>empty path name is not legal</p>
  </blockquote>
  
  <p>Have any idea to solve this?!</p>