avalonia/AvaloniaApplication1/Views/UserPage.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="AvaloniaApplication1.UserPage"
			 xmlns:vm="using:AvaloniaApplication1.ViewModels"
			 x:DataType="vm:UserViewModel">
	<Grid RowDefinitions="50,*,50" ColumnDefinitions="200,*" >
		<StackPanel Grid.Column="0" Grid.Row="1">
			<Button Content="Профиль" Command="{Binding toProfile}"/>
			<Button Content="Смешарики" Command="{Binding toSmesh}"/>
		</StackPanel>
		<TextBlock Text="Шарарам" Grid.ColumnSpan="2" HorizontalAlignment="Center"	VerticalAlignment="Center" Foreground="Yellow" FontSize="30" FontWeight="Black"></TextBlock>
		<TextBlock Text="Персонажи"  HorizontalAlignment="Center"  FontSize="30"> </TextBlock>
		<ContentControl Content="{Binding Page}" Grid.Column="1" Grid.Row="1"/>
	</Grid>

</UserControl>