title: ListBox doesn't show complete items
body: <p>I have Expanders in a ListBox. If I now put a ListView into the last Expander, the ListView has exactly the size to show all of the items. This is so far what I want.
  But now its not possible to scroll the ListBox down to the end of the ListView.</p>
  
  <p>What do I have to do in order to allow the user to scroll the ListBox down to the end of the last item, which is the end of the ListView?</p>
  
  <p>This is my simplified code:</p>
  
  <pre><code>&lt;Window x:Class="ExpanderTest.MainWindow"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      Title="MainWindow" Height="350" Width="525"&gt;
  &lt;Grid&gt;
      &lt;ListBox HorizontalContentAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Disabled"&gt;
  
          &lt;Expander Header="text"&gt;
              &lt;Grid&gt;
                  &lt;Grid.ColumnDefinitions&gt;
                      &lt;ColumnDefinition Width="*"/&gt;
                      &lt;ColumnDefinition Width="100"/&gt;
                  &lt;/Grid.ColumnDefinitions&gt;
                  &lt;Label Grid.Column="0"&gt;some text&lt;/Label&gt;
                  &lt;Label Grid.Column="1"&gt;some text&lt;/Label&gt;
              &lt;/Grid&gt;
          &lt;/Expander&gt;
  
          &lt;Expander Header="Buttons"&gt;
              &lt;Grid&gt;
                  &lt;Grid.RowDefinitions&gt;
                      &lt;RowDefinition /&gt;
                      &lt;RowDefinition /&gt;
                  &lt;/Grid.RowDefinitions&gt;
                  &lt;Button Grid.Row="0"&gt;Button1&lt;/Button&gt;
                  &lt;StackPanel Grid.Row="1" Orientation="Horizontal"&gt;
                      &lt;Button&gt;Button2&lt;/Button&gt;
                      &lt;Button&gt;Button3&lt;/Button&gt;
                      &lt;Button&gt;Button4&lt;/Button&gt;
                      &lt;Button&gt;Button5&lt;/Button&gt;
                  &lt;/StackPanel&gt;
              &lt;/Grid&gt;
          &lt;/Expander&gt;
  
          &lt;Expander Header="Much Information" IsExpanded="True"&gt;
              &lt;ListView&gt;
                  &lt;ListView.View&gt;
                      &lt;GridView&gt;
                          &lt;GridView.Columns&gt;
                              &lt;GridViewColumn Header="Variable" Width="160" /&gt;
                          &lt;/GridView.Columns&gt;
                      &lt;/GridView&gt;
                  &lt;/ListView.View&gt;
                  &lt;ListViewItem&gt;Line 0&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 1&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 2&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 3&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 4&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 5&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 6&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 7&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 8&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 9&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 10&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 11&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 12&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 13&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 14&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 15&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 16&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 17&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 18&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 19&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 20&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 21&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 22&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 23&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 24&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 25&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 26&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 27&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 28&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 29&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 30&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 31&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 32&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 33&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 34&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 35&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 36&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 37&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 38&lt;/ListViewItem&gt;
                  &lt;ListViewItem&gt;Line 39&lt;/ListViewItem&gt;
              &lt;/ListView&gt;
          &lt;/Expander&gt;
      &lt;/ListBox&gt;
  &lt;/Grid&gt;
  </code></pre>
  
  <p></p>