ViewB.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="Lemon.ModuleNavigation.Sample.ModuleBs.ViewB">
	<StackPanel Orientation="Vertical" Spacing="10">
		<TextBlock Text="{Binding Greeting}" />
		<Button
            Command="{Binding NavigateCommand}"
            CommandParameter="ModuleA"
            Content="ToModuleA" />
		<Button
            Command="{Binding NavigateCommand}"
            CommandParameter="ModuleC"
            Content="ToModuleC" />
	</StackPanel>
</UserControl>