FolderInfoPanel.xaml

<UserControl x:Class="QuickLook.Plugin.FolderViewer.FolderInfoPanel"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:local="clr-namespace:QuickLook.Plugin.FolderViewer"
             mc:Ignorable="d"
             x:Name="infoPanel"
             d:DesignHeight="600" d:DesignWidth="800">
    <UserControl.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <!-- only for design -->
                <ResourceDictionary Source="/QuickLook.Common;component/Styles/MainWindowStyles.xaml" />
            </ResourceDictionary.MergedDictionaries>
            <local:Percent100ToVisibilityVisibleConverter x:Key="Percent100ToVisibilityVisibleConverter" />
            <local:Percent100ToVisibilityCollapsedConverter x:Key="Percent100ToVisibilityCollapsedConverter" />
        </ResourceDictionary>
    </UserControl.Resources>
    <Grid>
        <Grid ZIndex="9999"
              Visibility="{Binding ElementName=infoPanel, Path=LoadPercent, Mode=OneWay, Converter={StaticResource Percent100ToVisibilityCollapsedConverter}}">
            <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
                <Label x:Name="lblLoading" FontSize="14" HorizontalAlignment="Center" Foreground="{DynamicResource WindowTextForeground}">Loading ...</Label>
                <ProgressBar Height="13" Width="150"
                             Value="{Binding ElementName=infoPanel, Path=LoadPercent, Mode=OneWay}" />
            </StackPanel>
        </Grid>
        <Grid
            Visibility="{Binding ElementName=infoPanel, Path=LoadPercent, Mode=OneWay, Converter={StaticResource Percent100ToVisibilityVisibleConverter}}">
            <Grid.RowDefinitions>
                <RowDefinition />
                <RowDefinition Height="30" />
            </Grid.RowDefinitions>
            <local:FileListView Grid.Row="0" x:Name="fileListView" Focusable="False" Foreground="{DynamicResource WindowTextForeground}" />
            <Grid Grid.Row="1">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="40*" />
                    <ColumnDefinition Width="30*" />
                    <ColumnDefinition Width="30*" />
                </Grid.ColumnDefinitions>
                <Label x:Name="totalSize" Grid.Column="0" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="{DynamicResource WindowTextForegroundAlternative}">Total Size: 0B</Label>
                <Label x:Name="numFolders" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="{DynamicResource WindowTextForegroundAlternative}">Folders: 0</Label>
                <Label x:Name="numFiles" Grid.Column="2" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="{DynamicResource WindowTextForegroundAlternative}">Files: 0</Label>
            </Grid>
        </Grid>
    </Grid>
</UserControl>