Why isnt my Background color working in a ComboBox
<p>The only part of my Combo Box that isn't working is the Background Color. I want the whole thing to be yellow. But the collapsed part is still just gray.</p>

<pre><code>&lt;ComboBox Height="25" Width="125" Background="Yellow"&gt;
    &lt;ComboBox.ItemContainerStyle&gt;
        &lt;Style TargetType="ComboBoxItem"&gt;
            &lt;Setter Property="Background" Value="Yellow"/&gt;
            &lt;Setter Property="BorderBrush" Value="Yellow"/&gt;
        &lt;/Style&gt;
    &lt;/ComboBox.ItemContainerStyle&gt;
    &lt;ComboBoxItem Content="One"/&gt;
    &lt;ComboBoxItem Content="Two"/&gt;
    &lt;ComboBoxItem Content="Three"/&gt;
&lt;/ComboBox&gt;
</code></pre>