Hi Bradley,
It's hard to say with out a sample, as there are several elements at play. Most likely is you'd need to customize the background color of the EditorView. Something like:
<Style TargetType="{x:Type editor:EditorView}">
<Setter Property="Background" Value="Red" />
</Style>
Alternatively, you can customize it's default brush like so:
<SolidColorBrush x:Key="{x:Static themes:SyntaxEditorCommonDictionary.EditorViewBackgroundBrushKey}" Color="Red" />
If that doesn't help please put together a small sample project that reproduces your issue and email it over then we can take a closer look. Be sure to remove any executables or change the extension of the zip file to ensure it gets past our email filters.
