avalonia/AvaloniaApplication1/Views/UpdateUsers.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.UpdateUsers"
			  xmlns:vm="using:AvaloniaApplication1.ViewModels"
			 x:DataType="vm:UpdateUsersViewModel">
	<StackPanel>
		<StackPanel>
			<Button Content="Назад" Command="{Binding Back}"/>
		</StackPanel>
		<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
			<TextBlock Text="Фамилия:" Margin="0 5"/>
			<TextBox Text="{Binding User.LastName}" Watermark=" Введите фамилию"/>
			<TextBlock Text="Имя:" Margin="0 5"/>
			<TextBox Text="{Binding User.FirstName}" Watermark="Введите имя"/>
			<TextBlock Text="Отчеcтво:" Margin="0 5"/>
			<TextBox Text="{Binding User.Patronymic}" Watermark="Введите отчество"/>

			<TextBlock Text="Пол: " Margin="0 5"/>
			<ComboBox ItemsSource="{Binding GenderList}" SelectedItem="{Binding SelectedGender}">
				<ComboBox.ItemTemplate>
					<DataTemplate>
						<TextBlock Text="{Binding Title}"/>
					</DataTemplate>
				</ComboBox.ItemTemplate>
			</ComboBox>

			<TextBlock Text="Введите дату рождения: " Margin="0 5"/>
			<DatePicker SelectedDate="{Binding DateTimeOffset}"/>

			<TextBlock Text="Логин" Margin="0 5"/>
			<TextBox  Text="{Binding User.Login}" Watermark="Введите логин"  Margin="0 5"/>


			<TextBlock Text="Пароль" Margin="0 5"/>
			<TextBox  Text="{Binding User.Password}" Watermark="Введите пароль" PasswordChar="*" Margin="0 5"/>


		</StackPanel>
	</StackPanel>
</UserControl>