title: Dialog window positioning
body: <p>I'm creating a small non-modal dialog in TornadoFX like this:</p>
  
  <pre><code>find&lt;Grib&gt;(scope).apply { openModal(block = true,
                            owner = FX.primaryStage,
                            stageStyle = StageStyle.UTILITY,
                            modality = Modality.NONE) }
  </code></pre>
  
  <p>How do I go about setting (and retrieving) it's window position for later?  That is, I have a preferences object for the window location and I want to update it so that the next time the user opens the window, it opens in the same place they last closed it.</p>