<testing:Login xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Авторизация" Height="240" Width="300" WindowStartupLocation="CenterScreen" ResizeMode="NoResize">
    <StackPanel Margin="10">
        <TextBox Name="email" MaxWidth="250" MinWidth="150" HorizontalAlignment="Center" Text="{Binding login}" />
        <TextBox Name="password" MaxWidth="250" MinWidth="150" HorizontalAlignment="Center" Text="{Binding pass}" />
        <Button Margin="20" MaxWidth="150" MinWidth="50" Content="Войти" />
        <Button MaxWidth="150" MinWidth="50" Content="Регистрация" />
    </StackPanel>
</testing:Login>