How to Change the Style on AvalonEdit CodeCompletion Window? <p>I'm trying to figure out how to change the style of the AvalonEdit CodeCompletion window. However, I can't figure out the right combination of xaml style target/properties to change it. The main thing I'd like to do is get rid of the border, but maybe some additional changes as well.</p> <p>Here is the xaml I've tried. None of it is affecting the UI.</p> <pre><code> xmlns:ae="clr-namespace:ICSharpCode.AvalonEdit.CodeCompletion;assembly=ICSharpCode.AvalonEdit" &lt;Style TargetType="{x:Type ae:CompletionWindow}"&gt; &lt;Setter Property="WindowStyle" Value="None" /&gt; &lt;/Style&gt; &lt;Style TargetType="{x:Type ae:CompletionWindowBase}"&gt; &lt;Setter Property="WindowStyle" Value="None" /&gt; &lt;/Style&gt; &lt;Style TargetType="{x:Type ae:CompletionListBox}"&gt; &lt;Setter Property="Background" Value="Red" /&gt; &lt;/Style&gt; &lt;Style TargetType="{x:Type ae:CompletionList}"&gt; &lt;Setter Property="Background" Value="Orange" /&gt; &lt;/Style&gt; </code></pre>