Hello,

It has been a while since you have made your post, in case you still need support I will be glad to assist you further. I suppose the other community members can benefit from this answer as well. I have been looking through your post I suggest you use the following styles for the SummaryRecordPresenter and SummaryResultsPresenter in order to have the look you want. The trick here is that you have to set the Border that is in the SummaryResultsPresenter’s Template Background instead of its own Background.

<Style TargetType="{x:Type igDP:SummaryRecordPresenter}">
    <Setter Property="Background" Value="White"/>
</Style>
<Style TargetType="{x:Type igDP:SummaryResultsPresenter}">
    <Style.Resources>
        <DataTemplate DataType="{x:Type igDP:SummaryResult}">
            <igDP:SummaryResultPresenter SummaryResult="{Binding}"/>
        </DataTemplate>
    </Style.Resources>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type igDP:SummaryResultsPresenter}">
                <Border
			Background="LightGray"
			BorderBrush="{TemplateBinding BorderBrush}"
			BorderThickness="{TemplateBinding BorderThickness}"
			Padding="{TemplateBinding Padding}"
			SnapsToDevicePixels="true">
                    <ItemsControl ItemsSource="{TemplateBinding SummaryResults}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                        <ItemsControl.ItemsPanel>
                            <ItemsPanelTemplate>
                                <StackPanel CanHorizontallyScroll="false" CanVerticallyScroll="false"/>
                            </ItemsPanelTemplate>
                        </ItemsControl.ItemsPanel>
                    </ItemsControl>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Feel free to write me if you have further questions.