MainWindow.xaml

<Window x:Class="w10mu.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:w10mu"
        mc:Ignorable="d"
        Title="Windows 10 Manual Update" Height="403.948" Width="411.842">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid Margin="12">
            <Grid.RowDefinitions>
                <RowDefinition Height="*"/>
                <RowDefinition Height="12"/>
                <RowDefinition Height="*"/>
                <RowDefinition Height="Auto"/>
            </Grid.RowDefinitions>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="*"/>
                </Grid.RowDefinitions>
                <TextBlock Text="List of applicable updates:"/>
                <ListBox Grid.Row="1" x:Name="_list" SelectionChanged="ListSelectionChanged" SelectionMode="Single">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <StackPanel Orientation="Horizontal" Background="{Binding Background}">
                                <CheckBox Margin="0,0,5,0" IsChecked="{Binding Path=IsChecked}" Background="Transparent"/>
                                <TextBlock Text="{Binding Path=Title}" Background="Transparent"/>
                            </StackPanel>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
            </Grid>
            <GridSplitter Grid.Row="1" HorizontalAlignment="Stretch"/>
            <Grid Grid.Row="2">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="*"/>
                </Grid.RowDefinitions>
                <TextBlock Text="Description:"/>
                <RichTextBox Grid.Row="1" x:Name="_description" IsReadOnly="True" IsDocumentEnabled="True" Margin="0,0,0,12" ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Auto" />
            </Grid>
            <Button Grid.Row="3" x:Name="_installButton" Content="Install updates" HorizontalAlignment="Right" Width="140" Height="25" Click="Install_Click" IsEnabled="False" />
        </Grid>
        <StatusBar Grid.Row="1">
            <StatusBarItem>
                <TextBlock Name="_status" />
            </StatusBarItem>
        </StatusBar>
    </Grid>
</Window>