title: can't see the progress dialog
body: <p>I've modified Wix's InstallDir dialog set. I've removed the licence agreement and added my own dialog. I show the first dialog using:</p>
  
  <pre><code>    &lt;InstallUISequence&gt;
          &lt;Show Dialog="WelcomeDlg" Before="ExecuteAction"/&gt;          
      &lt;/InstallUISequence&gt;    
  </code></pre>
  
  <p>The dialog sequence works fine except that when the user clicks "install" on the last dialog, the dialog disappears and the application installs silently, without any progress bar. This is not a default behaviour of the WiX's InstallDir dialog set. The progress bar must be present. I wonder why it isn't displayed. Any ideas?</p>