NewAuthAndCaptcha/AuthAndCaptcha/Views/Auth.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"
			 xmlns:vm="using:AuthAndCaptcha.ViewModels"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="AuthAndCaptcha.Auth"
			 x:DataType="vm:MainWindowViewModel">
	
	<Grid>
		<StackPanel>
			<StackPanel Classes="authSP">
				<TextBlock Classes="authMainTitle">Авторизация</TextBlock>
			</StackPanel>
			<StackPanel Classes="loginPasswordSP">
				<StackPanel Classes="loginPasswordT">
					<TextBlock>логин</TextBlock>
					<TextBox Classes="authTB" Name="loginTextBox" Text="{Binding AuthVM.UsersLogin}"></TextBox>
				</StackPanel>
				<StackPanel Classes="loginPasswordT">
					<TextBlock>пароль</TextBlock>
					<TextBox Classes="authTB" Text="{Binding AuthVM.UsersPassword}"></TextBox>
				</StackPanel>
			</StackPanel>
			<StackPanel Classes="authSP">
				<Button Classes="authBut"  Command="{Binding Check}" IsVisible="{Binding AuthVM.AuthButtonVisible}">Войти</Button>
			</StackPanel>
			<StackPanel Classes="authSP" IsVisible="{Binding AuthVM.CanTextVisible}">
				<StackPanel Classes="authSP">
					<TextBlock>Введите данные заново и впишите цифры с рисунка</TextBlock>
				</StackPanel>
				<UserControl Content="{Binding AuthVM.Can}"></UserControl>
				<StackPanel Classes="authSP">
					<TextBox Classes="authTB" Text="{Binding AuthVM.CanText}"></TextBox>
				</StackPanel>
				<StackPanel Classes="authSP">
					<Button Classes="authBut" Command="{Binding CheckCaptcha}">Проверить</Button>
				</StackPanel>
			</StackPanel>
		</StackPanel>
	</Grid>
</UserControl>