Walleby/Bitvault.Avalonia/VaultNavigationView.axaml

<NavigationViewItem
    x:Class="Bitvault.Avalonia.VaultNavigationView"
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:vm="using:Bitvault"
    x:Name="NavigationViewItem"
    x:DataType="vm:VaultNavigationViewModel"
    Content="{Binding Name}"
    IsExpanded="{Binding Expanded, Mode=TwoWay}"
    IsSelected="{Binding Selected}"
    MenuItemsSource="{Binding}"
    SelectsOnInvoked="True">
    <Interaction.Behaviors>
        <DataTriggerBehavior Binding="{Binding Opened}" Value="False">
            <ConditionAction>
                <ConditionAction.Condition>
                    <ConditionalExpression ForwardChaining="And">
                        <ComparisonCondition LeftOperand="{Binding Selected}" RightOperand="True" />
                    </ConditionalExpression>
                </ConditionAction.Condition>
                <NavigateAction Context="Main" Route="OpenVault" />
                <ChangePropertyAction
                    PropertyName="SelectsOnInvoked"
                    TargetObject="{Binding #NavigationViewItem}"
                    Value="True" />
            </ConditionAction>
        </DataTriggerBehavior>
        <DataTriggerBehavior Binding="{Binding Opened}" Value="True">
            <ConditionAction>
                <ConditionAction.Condition>
                    <ConditionalExpression ForwardChaining="And">
                        <ComparisonCondition LeftOperand="{Binding Selected}" RightOperand="True" />
                    </ConditionalExpression>
                </ConditionAction.Condition>
                <NavigateAction Context="Main" Route="Vault" />
                <ChangePropertyAction
                    PropertyName="SelectsOnInvoked"
                    TargetObject="{Binding #NavigationViewItem}"
                    Value="False" />
                <SelectNavigationViewItemAction />
            </ConditionAction>
        </DataTriggerBehavior>
        <NavigationViewItemInvokedBehaviour SelectsChildOnInvoked="True">
            <ConditionAction>
                <ConditionAction.Condition>
                    <ConditionalExpression ForwardChaining="And">
                        <ComparisonCondition LeftOperand="{Binding Opened}" RightOperand="False" />
                        <ComparisonCondition LeftOperand="{Binding #NavigationViewItem.IsChildSelected}" RightOperand="False" />
                    </ConditionalExpression>
                </ConditionAction.Condition>
                <NavigateAction Context="Main" Route="OpenVault" />
            </ConditionAction>
            <ConditionAction>
                <ConditionAction.Condition>
                    <ConditionalExpression ForwardChaining="And">
                        <ComparisonCondition LeftOperand="{Binding Opened}" RightOperand="True" />
                        <ComparisonCondition LeftOperand="{Binding #NavigationViewItem.IsChildSelected}" RightOperand="False" />
                    </ConditionalExpression>
                </ConditionAction.Condition>
                <NavigateAction Context="Main" Route="Vault" />
            </ConditionAction>
        </NavigationViewItemInvokedBehaviour>
    </Interaction.Behaviors>
</NavigationViewItem>