Walleby/Wallet.Avalonia/MainView.axaml

<UserControl
    x:Class="Wallet.Avalonia.MainView"
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:ui="using:FluentAvalonia.UI.Controls"
    xmlns:vm="using:Wallet"
    x:DataType="vm:MainViewModel">
    <NavigationView
        x:Name="NavigationView"
        FooterMenuItemsSource="{Binding Footer}"
        IsSettingsVisible="False"
        MenuItemTemplate="{Binding Template}"
        MenuItemsSource="{Binding}"
        SelectedItem="{Binding SelectedItem}">
        <Interaction.Behaviors>
            <DataTriggerBehavior Binding="{ReflectionBinding SelectedItem.IsOpened}" Value="True">
                <InvokeNavigationViewItemAction SelectedIndex="1" />
            </DataTriggerBehavior>
        </Interaction.Behaviors>
        <NavigationView.PaneHeader>
            <Border
                Margin="12,0,0,0"
                Padding="12,4,12,4"
                HorizontalAlignment="Left"
                VerticalAlignment="Center"
                Background="{DynamicResource AccentFillColorDefaultBrush}"
                CornerRadius="12">
                <TextBlock
                    FontSize="10"
                    Foreground="{DynamicResource TextOnAccentFillColorPrimaryBrush}"
                    Text="PREVIEW 4" />
            </Border>
        </NavigationView.PaneHeader>
        <NavigationView.PaneCustomContent>
            <Grid RowDefinitions="*,Auto">
                <ContentControl Grid.Row="0">
                    <Interaction.Behaviors>
                        <AttachedBehaviour>
                            <NavigateAction Region="{Binding $self}" Route="Wallets" />
                        </AttachedBehaviour>
                    </Interaction.Behaviors>
                </ContentControl>
                <NavigationViewItemSeparator Grid.Row="1" />
            </Grid>
        </NavigationView.PaneCustomContent>
        <NavigationView.Resources>
            <CornerRadius x:Key="NavigationViewContentGridCornerRadius">0</CornerRadius>
            <Thickness x:Key="NavigationViewContentGridBorderThickness">1,0,0,0</Thickness>
        </NavigationView.Resources>
        <Frame>
            <Interaction.Behaviors>
                <AttachedBehaviour>
                    <NavigateRegionAction Name="Main">
                        <NavigateAction Region="Main" Route="Wallet" />
                    </NavigateRegionAction>
                </AttachedBehaviour>
            </Interaction.Behaviors>
        </Frame>
    </NavigationView>
</UserControl>