PR13/MainWindow.xaml

<Window x:Class="IS32_Shafrygin_PR13.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:IS32_Shafrygin_PR13"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="44*"/>
            <RowDefinition Height="330"/>
            <RowDefinition Height="45*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition Width="626"/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Rectangle Fill="#FFF4F4F5" Grid.Row="2" Stroke="Black" Grid.ColumnSpan="3" StrokeThickness="0"/>
        <Button x:Name="ButtonBack" Content="Назад" Margin="4,6,0,0" HorizontalAlignment="Left" Width="74" Height="32" VerticalAlignment="Top" Click="ButtonBack_Click"/>
        <Frame x:Name="MainFrame" Navigated="MainFrame_OnNavigated" Source="Pages/AuthPage.xaml" Grid.Row="1" Grid.ColumnSpan="3" Height="330" VerticalAlignment="Bottom"/>

    </Grid>
</Window>