<ListView ItemsSource="{Binding Badges}" Background="Transparent" BorderThickness="0" VerticalAlignment="Top"
HorizontalAlignment="Right" Margin="-21,2,-21,0" Visibility="{Binding BoxVisibility}">
<ListView.ItemTemplate>
<DataTemplate>
<Image x:Name="BadgeImage" Source="{Binding Path=Icon, Converter={StaticResource ImageToSourceConverter}}"
Width="20" Margin="0,0,0,5" RenderOptions.BitmapScalingMode="HighQuality" ToolTip="{Binding Name}" />
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="SnapsToDevicePixels" Value="True" />
<Setter Property="Margin" Value="0" />
<Setter Property="Padding" Value="0" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="BorderThickness" Value="0" />
<Setter Property="FocusVisualStyle" Value="{x:Null}" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListViewItem}">
<ContentPresenter x:Name="ContentPresenter" HorizontalAlignment="Stretch" VerticalAlignment="Top"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListView.ItemContainerStyle>
</ListView>
So I copied this section from the Default/BoxesContentView.xaml and pasted it into the BoxesContentView.xaml for the new theme in the same place.
For NoshOnThisTwice LB, it went at the end of this element just before the closing /Grid tag:
<ListView.ItemTemplate>
<DataTemplate>
<Grid Margin="{Binding Margin}">