Walleby/Bitvault.Avalonia/ItemCategoryNavigationView.axaml

<ListBoxItem
    x:Class="Bitvault.Avalonia.ItemCategoryNavigationView"
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:vm="using:Bitvault"
    x:DataType="vm:ItemCategoryNavigationViewModel"
    Content="{Binding Name}"
    IsSelected="{Binding Selected, Mode=TwoWay}">
    <Interaction.Behaviors>
        <AttachedBehaviour>
            <ConditionAction>
                <ConditionAction.Condition>
                    <ConditionalExpression ForwardChaining="And">
                        <ComparisonCondition LeftOperand="{Binding Selected}" RightOperand="True" />
                    </ConditionalExpression>
                </ConditionAction.Condition>
                <NavigateAction
                    Region="{Binding Named, StringFormat='{}{0}:Content'}"
                    Route="Item"
                    Scope="self">
                    <Parameter Key="Immutable" Value="{x:False}" />
                </NavigateAction>
            </ConditionAction>
        </AttachedBehaviour>
        <DataTriggerBehavior Binding="{Binding Selected}" Value="True">
            <NavigateAction
                Region="{Binding Named, StringFormat='{}{0}:Content'}"
                Route="Item"
                Scope="self">
                <Parameter Key="Immutable" Value="{x:False}" />
            </NavigateAction>
        </DataTriggerBehavior>
    </Interaction.Behaviors>
</ListBoxItem>