title: gwt-ext file upload
body: <p>I am trying to do a file upload from gwt-ext without bringing up the dialog box. To do this, I created a FormPanel and added the appropriate fields to it. Then did a form.submit(). This doesn't seem to work. Any idea why? The code is shown below.</p>
  
  <pre><code>final FormPanel uploadForm = new FormPanel();
  uploadForm.setVisible(false);
  uploadForm.setFileUpload(true);
  final TextField sourceFile = new TextField("File", "sourceFile");
  sourceFile.setVisible(false);
  sourceFile.setInputType("file");
  sourceFile.setValue("/tmp/test.txt");
  
  final TextField targetFile = new TextField("Upload As", "targetFile");
  targetFile.setVisible(false);
  targetFile.setValue("different.txt");
  
  uploadForm.add(sourceFile);
  uploadForm.add(targetFile);
  
  final String url = GWT.getModuleBaseURL() + "/uploadFile";
  uploadForm.getForm().submit(url, null, Connection.POST, null, false);
  </code></pre>
  
  <p>I tested the servlet on the server side with a simple html form and it works correctly. Only the GWT-EXT version doesn't seem to work.</p>