title: Why this.Grid.RestoreLayoutFromXml doesn't work?
body: <p>I create my own class, and inherit from TableView.</p>
  
  <pre><code>public class ABGridView : TableView
  {
  </code></pre>
  
  <p>in this class I save current layout like this</p>
  
  <pre><code>string fileName = @"D:\aa.xml";
  this.Grid.SaveLayoutToXml(fileName);
  </code></pre>
  
  <p>and it's work, but when I'm trying to restore layout it doesn't work. </p>
  
  <pre><code>private void ABGridView_Loaded(object sender, RoutedEventArgs e)
  {
        string fileName = @"D:\aa.xml";
        this.Grid.RestoreLayoutFromXml(fileName);
  }
  </code></pre>
  
  <p>So I need your helps friends. I can't understand why it doesn't work...
  Thanks ...</p>