RKIS/Task1/View/MainWindow.xaml

<Window x:Class="Task1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        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:local="clr-namespace:Task1"
        mc:Ignorable="d"
        Title="Авторизация" MinHeight="450" MinWidth="700" Height="350" Width="600" MaxHeight="450" MaxWidth="800" Background="#FFD3E8F9">
    <Grid Margin="0,8,0,-8">
        <Grid.RowDefinitions>
            <RowDefinition Height="79*"/>
            <RowDefinition Height="32*"/>
            <RowDefinition Height="29*"/>
            <RowDefinition Height="22*"/>
            <RowDefinition Height="30*"/>
            <RowDefinition Height="51*"/>
            <RowDefinition Height="76*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="224*"/>
            <ColumnDefinition Width="187*"/>
            <ColumnDefinition Width="156*"/>
            <ColumnDefinition Width="125*"/>
        </Grid.ColumnDefinitions>
        <Label Content="Введите логин" HorizontalAlignment="Center" VerticalAlignment="Center" Width="136" Grid.Column="1" Grid.Row="1" FontSize="16" Height="30" Margin="41,0,10,2"/>
        <TextBox x:Name="Login1" Text="{Binding User.Login}" HorizontalAlignment="Left" TextWrapping="Wrap" Width="216" Grid.Row="2" Height="20" VerticalAlignment="Center" Grid.Column="1" Grid.ColumnSpan="2" Margin="41.2,9.6,0,8.8"/>
        <Label Content="Введите пароль" HorizontalAlignment="Center" VerticalAlignment="Center" Width="136" Grid.Column="1" Grid.Row="2" FontSize="16" Height="30" Margin="41,25,10,26" Grid.RowSpan="3"/>
        <PasswordBox x:Name="Password1" HorizontalAlignment="Left" VerticalAlignment="Center" Grid.Row="4" Grid.Column="1" Width="216" Height="20" Grid.ColumnSpan="2" Margin="41.2,9.4,0,9.8"/>
        <Button Content="Войти" Command="{Binding Login}" CommandParameter="{Binding ElementName =Password1}" Grid.Column="2" RenderTransformOrigin="0.226,0.499" Grid.Row="5" Margin="28,11,20,24"/>
        <Button Content="Зарегистрироваться" Command="{Binding Reg}"  Grid.Row="5" Grid.Column="1" Margin="31,11,23,24" />
        <Image Margin="20,44,10,37" Source="/Cat.png" Stretch="Fill" Grid.RowSpan="7"/>
    </Grid>
</Window>