title: WPF: ScrollViewer in grid
body: <p>I have a grid:</p>
  
  <pre><code>&lt;Grid.RowDefinitions&gt;
          &lt;RowDefinition Height="100"/&gt;
          &lt;RowDefinition Height="*"/&gt;
  &lt;/Grid.RowDefinitions&gt;
  </code></pre>
  
  <p>The second row is with scrollviewer:</p>
  
  <pre><code>    &lt;ScrollViewer VerticalScrollBarVisibility="Auto" MinHeight="400" Grid.Row="1"&gt;
              &lt;ItemsControl ItemsSource="{Binding SelectedUserControls}"/&gt;
      &lt;/ScrollViewer&gt;
  </code></pre>
  
  <p>I want the second row to be with scroll if needed,
  But the scroll is never visible, event if the items controls are bigger than the screen.</p>
  
  <p>How can i get the scroll to appear when needed?</p>