<Grid Margin="12">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <Label Content="Email:" VerticalAlignment="Center"/>
    <TextBox Grid.Column="1" Margin="8,4,0,4"/>
    <Label Grid.Row="1" Content="Пароль:" VerticalAlignment="Center"/>
    <PasswordBox x:Name="PassBox" Grid.Row="1" Grid.Column="1" Margin="8,4,0,4"/>
    <Button Grid.Row="2" Grid.Column="1" Content="Войти"
            HorizontalAlignment="Right" Margin="0,12,0,0" Click="OnLogin"/>
</Grid>