WhiteErase/WriteErase/ClassPages/PageAuthorization.xaml

<Page x:Class="WriteErase.ClassPages.PageAuthorization"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:WriteErase.ClassPages"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="PageAuthorization"
      FontFamily="Comic Sans MS">

    <Grid HorizontalAlignment="Center" VerticalAlignment="Center" Margin="15 10">
        <Border 
            MinWidth="300"
            MinHeight="250"
            Padding="15 10"
            CornerRadius="15"
            Background="{StaticResource yellowGreen}">

            <StackPanel>
                <TextBlock 
                    Text="Авторизация"
                    Style="{StaticResource Header}"
                    Margin="0 5 0 15"/>
                <GroupBox Header="Логин">
                    <TextBox
                        Name="tbxLogin"/>
                </GroupBox>
                <GroupBox Header="Пароль">
                    <PasswordBox
                        Name="pbxPassword"/>
                </GroupBox>
                <GroupBox Header="Каптча" Name="gbCaptcha" Visibility="Collapsed">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>

                        <Grid.RowDefinitions>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="*"/>
                        </Grid.RowDefinitions>
                        
                        <UserControl Name="cCaptcha" 
                                     Margin="10 0"
                                     Grid.Row="0" Grid.Column="0"/>
                            
                        <Button Name="btnGenerateCaptcha" 
                                Click="btnGenerateCaptchaClick" 
                                Style="{StaticResource Restart}"
                                Grid.Row="0" Grid.Column="1"/>

                        <GroupBox Header="Введите каптчу" Grid.Row="1" Grid.ColumnSpan="2">
                            <TextBox Name="tbxCaptcha" />
                        </GroupBox>
                        
                    </Grid>                   
                </GroupBox>
                <Button
                    Name="btnEnter"
                    Content="Войти"
                    Click="btnEnterClick" 
                    Margin="0 20"/>
                <Button
                    Name="btnGuest"
                    Content="Войти как гость"
                    Click="btnGuestClick"
                    Style="{StaticResource WithoutBackground}"/>
            </StackPanel>
            
        </Border>
    </Grid>
</Page>