title: How show contents of wpf window in stack panel
body: <p>i want to show contents of window in wpf when click on button 
  i think will use container controls like stake panel but doesn't work</p>
  
  <pre><code>private void RibbonButton_Click(object sender, RoutedEventArgs e)
      {
          Window1 w1 = new Window1();
          stkShow.Children.Add(w1);
      }
  </code></pre>