AvaloniaProject/ApplicationAvalonia/Views/RegestView.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"
             xmlns:vm="clr-namespace:ApplicationAvalonia.ViewModels"
             x:DataType="vm:RegestViewModel"
             x:Class="ApplicationAvalonia.Views.RegestView">

  <DockPanel VerticalAlignment="Center" HorizontalAlignment="Center">

    <StackPanel Orientation="Vertical">
            
      <TextBlock Text="Регистрация" HorizontalAlignment="Center" FontSize="24" />

      <TextBox Watermark="User name" Text="{Binding Name}"/>

      <TextBox Watermark="User surname" Text="{Binding Surname}" />

      <TextBox Watermark="Login" Text="{Binding Login}" />

      <TextBox Watermark="Password" PasswordChar="*" Text="{Binding Password}" />

      <TextBlock Text="{Binding Message}" Foreground="Red"/>

      <Button HorizontalAlignment="Center" Command="{Binding RegistrationBtnCommand}"
              VerticalAlignment="Center" Content="Зарегистрироваться" />
      
            
    </StackPanel>

  </DockPanel>



</UserControl>