title: ListBox Vertical Scrollbar does not show up (WPF)
body: <p>I have a view that should display information and to test it I added testdata. However if I add too much items for screen space the vertical scroll bar does not appear.</p>
  
  <p>This is my XML Code: </p>
  
  <pre><code>&lt;UserControl x:Class="not relevant"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
      xmlns:local="not relevant"
      mc:Ignorable="d"
       Width="250"&gt;
  
  &lt;Border Background="{DynamicResource  BG}" BorderBrush="{DynamicResource  BorderBrush}" BorderThickness="1"&gt;
      &lt;StackPanel&gt;
          &lt;Grid&gt;
              &lt;Label  Height="30" Content="Geöffnete Designs" HorizontalContentAlignment="Center"&gt;&lt;/Label&gt;
              &lt;Separator Background="DarkGray"/&gt;
              &lt;ListBox  Background="{DynamicResource BG}" BorderThickness="0" VerticalAlignment="Stretch" &gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
                  &lt;ListBoxItem&gt;
                      &lt;Label Content="Hallo"&gt;&lt;/Label&gt;
                  &lt;/ListBoxItem&gt;
              &lt;/ListBox&gt;
          &lt;/Grid&gt;
      &lt;/StackPanel&gt;
  &lt;/Border&gt;
  </code></pre>
  
  <p></p>
  
  <p>I tried adding a Scroll viewer instead but that didn't work properly. Am I doing something wrong or what might me the problem?</p>