avalonia/AvaloniaApplication1/Views/Enter.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.Enter"
			 xmlns:vm="using:AvaloniaApplication1.ViewModels"
			 x:DataType="vm:MainWindowViewModel">
	<StackPanel Margin="20" Width="500" Height="200" VerticalAlignment="Center" HorizontalAlignment="Center" >
		<TextBlock Text="Введите логин" Margin="0 5"/>
		<TextBox  Text="{Binding Login}" Watermark="Введите логин"/>
		<TextBlock Text="Введите пароль" Margin="0 5"/>
		<TextBox  Text="{Binding Password}" Watermark="Введите пароль" PasswordChar="*" Margin="0 5"/>

		<Button Width="100" Height="30" Content="Войти" Command="{Binding SignIn}"/>

		<TextBlock Text="{Binding Info}"></TextBlock>
		
	</StackPanel>
</UserControl>