title: UWP FolderPicker - show the dialog window centered over parent
body: <p>In a button click handler I am showing a <strong>FolderPicker</strong> dialog using the following piece of code:</p>
  <pre><code> var folderPicker = new FolderPicker();            
   folderPicker.SuggestedStartLocation = PickerLocationId.Desktop;
   folderPicker.FileTypeFilter.Add(&quot;*&quot;);
   StorageFolder folder = await folderPicker.PickSingleFolderAsync();
  </code></pre>
  <p>The dialog window is shown in the upper left corner of the screen. I would like the window to appear centered over the parent window. How do I do that?</p>