<ResourceDictionary xmlns="https://github.com/avaloniaui"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ControlTheme x:Key="{x:Type AdornerLayer}" TargetType="AdornerLayer">
        <Setter Property="DefaultFocusAdorner">
            <FocusAdornerTemplate>
                <Rectangle Margin="1"
                           Stroke="{DynamicResource ThemeAccentBrush}"
                           RadiusX="{DynamicResource ControlCornerRadiusValue}"
                           RadiusY="{DynamicResource ControlCornerRadiusValue}"
                           StrokeThickness="1" />
            </FocusAdornerTemplate>
        </Setter>
    </ControlTheme>
</ResourceDictionary>