title: WPF ContextMenu Design. How to set Background in WPF MenuItem?
body: <p>I create popup menu like this.</p>
  
  <pre><code>&lt;DockPanel.ContextMenu&gt;
      &lt;ContextMenu Background="#CD252220" Opacity="0.95" Foreground="LightGray" BorderBrush="DarkGray"&gt;
          &lt;MenuItem Header="_Save Image..." x:Name="btSave" IsEnabled="False" Click="btSave_Click" Style="{StaticResource MyStyle}"&gt;
              &lt;MenuItem.Icon&gt;
                  &lt;Image Source="icons/save.png" Width="16" Height="16" Style="{StaticResource IconStyle}"/&gt;
              &lt;/MenuItem.Icon&gt;
          &lt;/MenuItem&gt;
      &lt;/ContextMenu&gt;
  &lt;/DockPanel.ContextMenu&gt;
  </code></pre>
  
  <p><strong>Why left-side of this menu is WHITE?????</strong> It'll be a #CD252220 color or transparent, bun not white!!!!!!
  How to fix it? :)</p>
  
  <p><a href="http://itrash.ru/idb/40e872e71346dcf9bd58ba8aec0b2a17/omenu.png.html" rel="nofollow noreferrer">http://itrash.ru/idb/40e872e71346dcf9bd58ba8aec0b2a17/omenu.png.html</a> - menu screenshot</p>
  
  <p>P.S. In XP it's OK. Menu is <strong>White</strong> only on Vista (don't have W7)</p>