avaloniaProject/Views/Autorization.axaml

<UserControl xmlns="https://github.com/avaloniaui"
			 xmlns:vm="using:avaloniaPr.ViewModels"
             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:DataType="vm:MainWindowViewModel"
             x:Class="avaloniaPr.Views.Autorization">
	<Grid Background="Gray">
		<Grid.RowDefinitions>
			<RowDefinition Height="0.1*"/>
			<RowDefinition Height="0.3*"/>
			<RowDefinition Height="0.3*"/>
			<RowDefinition Height="0.6*"/>
		</Grid.RowDefinitions>
		<Grid.ColumnDefinitions>
			<ColumnDefinition Width="0.3*"/>
			<ColumnDefinition/>
			<ColumnDefinition Width="0.3*"/>
		</Grid.ColumnDefinitions>
		<TextBlock Text="Авторизация" Classes="centerTB" Grid.Row="1" Grid.Column="1"/>
	<StackPanel Grid.Row="2" Grid.Column="1">
        <TextBox Name="TBLogin" Text="{Binding LoginUs}" IsEnabled="{Binding Enabled}" Classes="TBMain"/>
        <TextBox Name="TBPassword" Text="{Binding PasswordUs}" IsEnabled="{Binding Enabled}" Classes="TBMain"/>
	</StackPanel>
		<StackPanel Grid.Row="3" Grid.Column="1">
			<UserControl Content="{Binding CanvasText}" IsVisible="{Binding VisibilityCaptcha}"/>
			<TextBox Text="{Binding Capcha}" IsVisible="{Binding VisibilityCaptcha}" Classes="TBMain" Width="210"/>
			<TextBlock Text="{Binding Waiting}" IsVisible="{Binding VisibilityWaiting}" Classes="centerTB"/>
			<Button IsVisible="{Binding VisibilityCaptcha}" Command="{Binding CommandCaptcha}" Content="Отправить" Classes="ButtonStyle"/>
			<Button Content="{Binding AutorizationVM.TextButton}" Command="{Binding AutorizationButton}" IsVisible="{Binding VisibilityButton}" Classes="ButtonStyle"/>
		</StackPanel>
	</Grid>
</UserControl>