In a WPF ListBox, how to "copy" the focused selection style for items over to the non-focused selection style?

user_1560865 0
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First of all, this is not a duplicate of Setting the Inactive Highlight Colour of a WPF ListBox to the Active Highlight Colour. An explanation for that is given below.

Setting:

I have a WPF ListBox in a UserControl that will later be put into an application that uses heavy theming. From the perspective of the UserControl, I don't know in advance what the theming will be like.

Desired behavior:

If the ListBox does not have focus at some point, I still want the selected ListBoxItems to have the same appearance as if the ListBox does have focus.

Additional information:

Note that just setting the colors to some system defaults will not work. Doing so would override the containing application's theming. (That's the reason why this question is not a duplicate of the linked question above.)

Is there a way to realize this, e.g. using XAML?

EDIT: After a bit of research, I think I want to create a copy of the "default" ListBoxItem style ("default" at least in terms of being the default at the level of the UserControl), where all Triggers with Property="Button.IsFocused" Value="False" will not be triggered and all Triggers with Property="Button.IsFocused" Value="True" will always be triggered.

Unfortunately I have no clue where to even start to perform research in how to accomplish this. So any hints towards places where I can start researching would be much appreciated as well.

listbox xaml wpf
2 Answers

The shortest variant that has been achieved

<ListBox ItemsSource="{Binding ElectrEquipAll}"
                <ListBox.ItemContainerStyle>
                    <Style TargetType="ListBoxItem" >
                        <Setter Property="IsSelected" Value="{Binding IsSelected}"/>
                        <Setter Property="Template">
                            <Setter.Value>
                                <ControlTemplate TargetType="ListBoxItem">
                                    <Border x:Name="Bd"  BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                    </Border>
                                    <ControlTemplate.Triggers>
                                        <Trigger Property="IsMouseOver" Value="True">
                                            <Setter Property="Background"  Value="#1F26A0DA"/>
                                            <Setter Property="BorderBrush"  Value="#a826A0Da"/>
                                        </Trigger>
                                        <Trigger Property="IsSelected" Value="True">
                                            <Setter Property="Background"  Value="#3D26A0DA"/>
                                            <Setter Property="BorderBrush"  Value="#FF26A0DA"/>
                                        </Trigger>
                                    </ControlTemplate.Triggers>
                                </ControlTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>
                </ListBox.ItemContainerStyle>
            </ListBox>
user_181145270
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