FirstAvalonia/AvaloniaExample/Views/Page2.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="AvaloniaExample.Views.Page2">
	<StackPanel>
		<TextBlock Text="Страница админа"/>
	</StackPanel> 
</UserControl>